02.04.2025, 14:00-15:30  –  2.27.1.01
SFB-Kolloquium

'Sparsity: The key to tackling large-scale least squares problems’ and 'Numerical linear algebra for data assimilation'

Jennifer Scott (STFC Rutherford Appleton Laboratory and The University of Reading, UK) & Jemima Tabeart (TU Eindhoven)

‘Sparsity: The key to tackling large-scale least squares problems’
Jennifer Scott

Linear least squares problems are a cornerstone of computational science and engineering. Over the years, the size of... 

20.02.2025, 10:15  –  Raum 0.12 in Haus 9
Forschungsseminar Differentialgeometrie

Kähler and quaternion-Kähler manifolds of non-negative curvature

Uwe Semmelmann (Stuttgart)

A well-known conjecture of LeBrun and Salamon states that quaternion Kähler manifolds of positive scalar curvature should be symmetric. This conjecture is still widely open. But even under the much... 

20.02.2025, 14:15  –  Raum 2.22 in Haus 9
Verteidigung Dissertation / PhD Defence

Index theory for geometric elliptic differential operators of first order

Alberto Richtsfeld (UP)

This thesis investigates the Local Index Theorem and the Atiyah-Patodi-Singer Index Theorem for geometric elliptic operators of first order beyond the classical Dirac-type operators.

Chiral geometric... 

13.02.2025, 10:00  –  Hörsaal in Haus 10
Forschungsseminar Differentialgeometrie

A gluing construction for complex surfaces with hyperbolic cusps

Hans-Joachim Hein (Münster)

We will describe an example of a degeneration of degree 6 algebraic surfaces in with an isolated triple point singularity on its central fiber. Then we will show how the unique... 

13.02.2025, 14:15  –  Raum 2.22 in Haus 9
Verteidigung Dissertation / PhD Defence

Symmetries and mode stability of gravitational instantons

Gustav Nilsson (UP)

We study two aspects of gravitational instantons: mode stability of gravitational instantons, and T 2 -symmetric (toric) gravitational instantons.
We study Ricci-flat perturbations of gravitational... 

11.02.2025, 12:00 – 14:00 Uhr  –  Campus Golm, Haus 28, Raum 0.108
Öffentlicher Vortrag

Lunch Talks: "Women in Science - Dialog der Generationen"

(English? click here; conversations are in German) (Flyer der Veranstaltung)

Wie jährlich anlässlich des UN-Tages "Women in Science" veranstalten wir am 11. Februar an der... 

11.02.2025, 12 – 2 pm  –  Campus Golm, Building 28, Room 0.108
Öffentlicher Vortrag

Lunch Talks: "Women in Science – Dialogue between Generations"

(Deutsch? Hier klicken; conversations are in German) (Event Flyer)

To celebrate the UN’s “Women in Science” Day, on February 11 the Faculty of Science and Mathematics at the University of Potsdam will... 

10.02. bis 14.02.2025  –  University of Potsdam, Campus Golm
Konferenz

Microlocal and Global Analysis, Interactions with Geometry 2025

The meeting is part of a series of meetings initiated by Professor Schulze devoted to micro-local, singular and global analysis and their interactions with geometry and mathematical physics.

Conferenc... 

07.02.2025, 10:00  –  Campus Golm, Building 9, Room 2.22 and via Zoom
Arbeitsgruppenseminar Analysis

The geometry of rough paths 2 - A dive into Carnot groups, Part 3

Felix Medwed (Potsdam)

This is the last talk of a series of talks on Carnot groups.

For more information and log in details please contact Christian Molle.

07.02.2025, 11:00  –  Campus Golm, Building 9, Room 2.22 and via Zoom
Arbeitsgruppenseminar Analysis

From spacetime dynamics to Hopf algebras

Stav Zalel (Cambridge, England) (online)

Causal set theory is an approach to quantum gravity in which spacetime is fundamentally discrete at the Planck scale. In this theory, spacetime takes the form of a locally finite partial order, or... 

06.02.2025, 16:15  –  Raum 0.14
Forschungsseminar Differentialgeometrie

On the existence of gaussian bounds for first order derivative of the heat kernel on a manifold with boundry and its application.

Ihsane Malass

We investigate the existence of gaussian bounds for  heat kernel constructed by the parametrix methods of E.E.Levi and the single / double layer  potential  on a manifold with boundary, and its... 

05.02.2025, 13:00  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

Spectral estimate for the Laplacian on hyperbolic surfaces

Marc Rouveyrol (Univ. Paris-Saclay)

Abstract: Spectral inequalities consist in bounding the norm of spectrally localized functions by their norm on a smaller, so-called "sensor" set, up to some factor depending on their frequency bound.... 

29.01.2025, 13:00  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

Dynamics of the Sturmian Trace Skew Product

Seung uk Jang (Université de Rennes)

Abstract: In this talk, we focus on the spectrum of the discrete Schrödinger equation with a quasi-periodic potential called Sturmianpotential. Eigenvector problem with a Sturmian potential is associa... 

22.01.2025, 13:00  –  Haus 9, Raum 2.22 und Zoom
Forschungsseminar Diskrete Spektraltheorie

Constructive gap-labelling and scaling properties of the Fibonacci Hamiltonian

Laurent Raymond (Marseille)

Abstract: With the recent publication of a solution of the the so-called « dry ten martinis problem », closing an old conjecture about the gap-labeling of of calls of aperiodic Schrödinger operators... 

17.01.2025, 11:00  –  Campus Golm, Building 9, Room 2.22 and via Zoom
Arbeitsgruppenseminar Analysis

Asymptotic symmetries in classical gauge theory - bridging between the Hamiltonian- and the BV-BFV perspective

Lena Janshen (Universität Göttingen)

Some physical systems are described by a mathematical model that has a redundancy. Such a model is called a gauge theory, where redundancies are described by gauge transformations. When the underlying... 

17.01.2025, 10:15 - 11:45  –  2.28.0.108
SFB-Kolloquium

Model Reduction in Pharmacology: Bridging Biological Understanding and Statistical Analysis

Jane Knöchel (InSilicoTrials, Sweden)

Quantitative system pharmacology models (QSP) are a subset of mathematical models focused on drug pharmacology. They integrate datasets from diverse studies, contexts, and spatiotemporal scales into a... 

17.01.2025, 10:00  –  Campus Golm, Building 9, Room 1.10 and via Zoom
Arbeitsgruppenseminar Analysis

The geometry of rough paths 2 - A dive into Carnot groups, Part 2

Felix Medwed (Potsdam)

This second talk will serve as supplementary material and will provide more details on the interesting concepts and background material presented in the first talk, like metric spaces, sub-Finsler... 

16.01.2025, 10:15 - 11:45  –  2.9.2.22
SFB-Seminar

From Model to Market: Enhancing Phase 3 Design with MID

Jane Knöchel (InSilicoTrials, Sweden)

Model Informed Drug Development (MIDD) has revolutionized the way pharmaceutical companies approach Phase 3 clinical trials. By integrating predictive modeling, MIDD enables more accurate and... 

16.01.2025, 16:30+  –  Raum 0.14
Forschungsseminar Differentialgeometrie

The Rarita-Schwinger Operator on the 3-Sphere with Homogeneous Metric

Peter Grabs

We investigate the Rarita-Schwinger operator using methods previously applied in the Dirac case. The structure of the underlying manifold as a Lie group implies... 

15.01.2025, 14:00 - 14:45  –  Campus Golm, Building 9, Room 2.22 and via Zoom
Institutskolloquium

A solution to Ringel’s circle problem

Linda Kleist (Universität Potsdam)

In 1959, Ringel asked for the chromatic number of tangency graphs of a collection of circles in the plane in which no three circles have the same tangent point. Particularly, he wondered whether a... 

15.01.2025, 13:00  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

Classical transport in a maximally chaotic chain

Remy Dubertrand (Northumbria university, UK)

Abstract: CAT maps (for Continuous Automorphisms on the Torus) are known as one family of chaotic systems. They have been intensively used to study the quantum/classical correspondence. In the last... 

15.01.2025, 11:00  –  Campus Golm, Building 9, Room 2.22 and via Zoom
Arbeitsgruppenseminar Analysis

The geometry of rough paths 2 - A dive into Carnot groups, Part 1

Felix Medwed (Potsdam)

This is the first of two talks about aspects of Carnot groups, following the book "Metric Lie Groups" by Le Donne (2024). We will however recall the construction of the smallest closed Lie subalgebra... 

10.01.2025, 11:00  –  Campus Golm, Building 9, Room 2.22 and via Zoom
Arbeitsgruppenseminar Analysis

Exploring quantum fields on rotating black holes

Christiane Klein (York University, UK)

Rotating black holes, which are the kind of black holes we observe in our universe, are an excellent stage on which to explore the effects of quantum physics. One possible approach to do so is the... 

08.01.2025, 13:00  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

Natural extensions of semigroup actions and applications to periodic approximations

Miguel Donoso Echenique (UC Chile)

Abstract: We review the property of periodic approximations (PA) for groups, and generalize some results to semigroups. In order to do this, we develop the tool of natural extensions, dealing with... 

18.12.2024, 13:00  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

On nonlinear Dirichlet forms

Simon Puchert (Jena)

Abstract: The subject of nonlinear Dirichlet forms is rather new and as such, still has many simple open questions. In this talk, we will establish a new characterization that more closely resembles... 

12.12.2024, 16:15  –  Raum 0.14
Forschungsseminar Differentialgeometrie

First steps towards an equivariant Lorentzian index theorem

Lennart Ronge (UP)

This is a work-in-progress description on an unfinished approach to proving a Lorentzian version of the equivariant index theorem, which assigns an index to a Dirac operator in the presence of a group... 

11.12.2024, 14:00 - 16:00  –  Campus Golm, Building 9, Room 2.22 and via Zoom
Institutskolloquium

Decoupling non-causality from the quantum, coupling gravity to relativistic quantum matter

Rainer Verch (Leipzig), Hanno Gottschalk (TU Berlin)

14:00  Rainer Verch (Universität Leipzig):  Quantum non-causality in spacetime may be not exclusively quantum.
14:45  Tea and Coffee Break
15:15  Hanno Gottschalk (TU Berlin):  How classical gravity... 

06.12.2024, 10:00  –  Campus Golm, Building 9, Room 1.10 and via Zoom
Arbeitsgruppenseminar Analysis

From modular graph forms to iterated integrals (Part 3)

Emiel Claasen (MPI, Potsdam)

Modular Graph Forms (MGFs) are a class of modular forms represented by lattice sums associated to directed simple graphs. They originated from the calculation of graviton amplitudes in type II string... 

06.12.2024, 11:00  –  Campus Golm, Building 9, Room 1.10 and via Zoom
Arbeitsgruppenseminar Analysis

Incomplete category of fibrant objects for higher derived shifted symplectic groupoids

Chenchang Zhu (Göttingen)

In this talk, based on many previous works, we will introduce a helpful new tool for differential geometers using:

• higher: to deal with quotient singularities
• derived: to heal transversality... 

06.12.2024, 13:30  –  Campus Golm, Building 9, Room 1.22 and via Zoom
Arbeitsgruppenseminar Analysis

The geometry of rough paths

Felix Medwed (Potsdam)

Following Chapter 8 of the book "An introduction to infinite dimensional geometry" by Alexander Schmeding, I will discuss the (infinite-dimensional) geometric framework for rough paths and their... 

05.12.2024, 16:15 Uhr  –  Raum 0.14
Forschungsseminar Differentialgeometrie

The equivariant index theorem with boundary.

Lennart Ronge

Given a Dirac type operator on a manifold with boundary and a group action that preserves all relevant structures, one can define a generalized index for any group element. Analogous to the APS index... 

04.12.2024, 13:30 - 14:45 (special session)  –  Campus Golm, Building 9, Room 2.22 and via Zoom
Institutskolloquium

Mathematical probability: Why a game-theoretic approach?

Glenn Shafer (Rutgers Business School, Newark)

Most applications of mathematical probability rely, in one way or another, on theorems that give certain events high probability. Since the 1950s, mathematicians have largely agreed that these... 

04.12.2024, 10:15 Uhr  –  Raum 2.22, Haus 9
Verteidigung Dissertation / PhD Defence

Statistical approaches to model reduction in systems pharmacology

Undine Falkenhagen

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29.11.2024, 12:15  –  Campus Golm, Building 9, Room 1.10
Forschungsseminar Wahrscheinlichkeitstheorie

Research Seminar Probability Theory

Alexey Bufetov (Leipzig)

mehr erfahren

28.11.2024, 12:15  –  Campus Golm, Building 9, Room 2.22
Verteidigung Masterarbeit / Master's Thesis Defence

Spectral Methods in Markov chain mixing

M.Abiri

Spectral Methods in Markov chain mixing

27.11. bis 29.11.2024  –  Campus "Am Neuen Palais" Building 8, Seminar room 0.58
Konferenz

QFT Workshop

Analytical methods in interplay with physics

A workshop to explore Asymptotics, Randomness and Noncommutativity

This three day workshop aims at fostering interactions between mathematicians who use... 

27.11.2024, 13:00 Uhr  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

Uniqueness for the heat equation on infinite graphs

Giulia Meglioli (Bielefeld)

Abstract: The talk is concerned with uniqueness of solutions to a class of heat equations with positive density posed on infinite weighted graphs. We separately consider the case when the density is... 

22.11.2024, 11:00  –  Campus Golm, Building 9, Room 2.22 and via Zoom
Arbeitsgruppenseminar Analysis

Matched pairs, post-Hopf algebras and the quantum Yang-Baxter equation

Yunan Li (Guangzhong, China) (online)

Recently, Ferri and Sciandra introduced two equivalent notions, matched pair of actions on a Hopf algebra and Yetter-Drinfeld brace. Any of these objects actually provides a solution of the quantum... 

20.11.2024, 14:00 - 16:00 (Special session)  –  Campus Golm, Building 9, Room 2.22 and via Zoom
Institutskolloquium

Quantitative elliptic homogenization: at the interface of PDEs, probability theory and statistical physics

Mitia Duerinckx (Brussel), Marius Lemm (Tübingen)

14:00  Mitia Duerinckx (Bruxelles):  Quantitative elliptic homogenization: a regularity perspective and Bourgain's surprising insight.
14:45  Tea and Coffee Break
15:15  Marius Lemm (Tübingen): ... 

15.11.2024, 13:00 (new time)  –  Campus Golm, Building 9, Room 1.22 and via Zoom
Arbeitsgruppenseminar Analysis

From modular graph forms to iterated integrals (Part 2)

Emil Claasen (MPI, Potsdam)

Abstract: Modular Graph Forms (MGFs) are a class of modular forms represented by lattice sums associated to directed simple graphs. They originated from the calculation of graviton amplitudes in type... 

15.11.2024, 11:15  –  Campus Golm, Building 9, Room 2.22 and via Zoom
Arbeitsgruppenseminar Analysis

Renormalising Non-Commutative Singular PDEs

Martin Peev (Inperial College, London) (online)

When attempting to construct QFTs that include Fermions using the methods of Stochastic Quantisation, one is naturally forced to consider noncommutative stochastic PDEs. I shall show how to formulate... 

11.11.2024, 13:00  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

Cheeger type inequalities associated with isocapacitary constants on graphs

Tao Wang (Fudan University Shanghai)

Abstract: In this talk, we introduce Cheeger type constants via isocapacitary constants introduced by Maz'ya to estimate first Dirichlet, Neumann and Steklov eigenvalues on a finite subgraph of a... 

08.11.2024, 15:00  –  2.09.2.22
Verteidigung Masterarbeit / Master's Thesis Defence

The Chern-Gauss-Bonnet theorem on semi-Riemannian manifolds

Marten Steuer (UP)

The Chern-Gauss-Bonnet theorem is one of the most fundamental results in Riemannian geometry, which connects the geometry of a compact, oriented Riemannian manifold with its topology. For... 

08.11.2024, 11:00  –  Campus Golm, Building 9, Room 2.22 and via Zoom
Arbeitsgruppenseminar Analysis

Malliavin calculus in regularity structures

Lucas Broux (MPIMS, Leipzig) (online)

This talk will be concerned with some aspects of the renormalization of the  stochastic partial differential equation, in the singular but subcritical (also called super-renormalizable)... 

08.11.2024, 14:00  –  Campus Golm, Building 9, Room 1.22 and via Zoom
Arbeitsgruppenseminar Analysis

Order and Number: the causal set approach to quantum gravity

Sumati Surya (Raman Research Institute, Bengalore)

In this talk I will sketch in broad lines a proposal for quantum space time, which is built purely on discrete, order theoretic principles. A key motivation is the Lorentzian character of spacetime,... 

07.11.2024, 16:15 Uhr  –  Raum 0.14
Forschungsseminar Differentialgeometrie

Scalar curvature along Ebin geodesics

Christoph Böhm (Münster)

Let be a smooth, compact manifold and let  denote the set of Riemannian metrics on with a fixed smooth volume density of volume 1. For any  , we show that... 

06.11.2024, 13:00  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

Every Salami has two ends

Florentin Münch (Universität Leipzig)

Abstract: In this talk, we prove that every salami has exactly two ends. As is well known to experts, a salami is a weighted graph with non-negative Ollivier Ricci curvature with at least two ends of... 

06.11.2024, 14:00 - 16:00  –  Campus Golm, Building 9, Room 2.22 and via Zoom
Institutskolloquium

Graphon Models for Inhomogeneous Random Graphs

Olga Klopp (Paris), Nicolas Verzelen (Montpellier)

14:00  Nicolas Verzelen (MISTEA Laboratory, INRAE, Univ. Montpellier)
14:45  Tea and Coffee Break
15:15  Olga Klopp (ESSEC Business School, CREST)

Title:     Network models and sparse graphon... 

01.11.2024, 10:15 - 11:30  –  2.28.0.108
SFB-Kolloquium

CRC Colloquium with Lothar Reichel

Lothar Reichel, Kent State University, USA

A tensor bidiagonalization method for singular value decomposition of third order tensors

The need to know a few singular triplets associated with the largest singular values of a third-order tensor... 

30.10.2024, 16:00  –  Zoom
Forschungsseminar Diskrete Spektraltheorie

Dimensional Properties for the Spectra of Sturmian Hamiltonians in a Small Coupling Regime

Alexandro Luna (UCI)

Abstract: We prove that the Hausdorff dimension of the spectrum of a Sturmian Hamiltonian of bounded type tends to one as the coupling constant tends to zero. We give a sketch of the proof which... 

30.10.2024, 16:00  –  Building 9, room 1.22
SFB-Seminar

Filtering SPDEs with Spatio-Temporal Point Process Observations

Jan Szalankiewicz

We develop the mathematical framework for filtering problems arising from biophysical applications where data is collected from confocal laser scanning microscopy recordings of the space-time... 

30.10.2024, 13:00  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

On the Eldan–Gross Inequality

Haonan Zhang (University of South Carolina)

Abstract: Recently, Eldan and Gross developed a stochastic analysis approach to proving functional inequalities on discrete hypercubes. Motivated by a conjecture of Talagrand, one of their main... 

30.10.2024, 10:15  –  2.09.0.14
Forschungsseminar: Gruppen und Operatoralgebren

K-theory of Hecke C*-algebras

Sven Raum (UP)

Hecke C*-algebras are deformations of the group C*-algebra of Coxeter groups. Their K-theory could so far only be determined in few cases. I will survey these and provide ideas of proof for the case... 

30.10.2024, 11:00  –  Campus Golm, Building 9, Room 2.22 and via Zoom
Arbeitsgruppenseminar Analysis

From modular graph forms to iterated integrals (Part 1)

Emiel Claasen (MPI, Potsdam)

Modular Graph Forms (MGFs) are a class of modular forms represented by lattice sums associated to directed simple graphs. They originated from the calculation of graviton amplitudes in type II string... 

25.10.2024, 14:00 (new time, special session)  –  Campus Golm, Building 9, Room 2.22 and via Zoom
Arbeitsgruppenseminar Analysis

Analytic Integration Methods in Quantum Field Theory

Johannes Blümlein (Desy, Zeuthen)

A survey is given on the present status of analytic calculation methods and the mathematical structures of zero- and single scale Feynman amplitudes which emerge in higher order perturbative... 

25.10.2024, 11:00  –  Campus Golm, Building 9, Room 2.22 and via Zoom
Arbeitsgruppenseminar Analysis

Euler's polyhedron formula applied to Kepler-Poinsot-polyhedra

Luisa Herrmann (Potsdam)

If one interprets the Kepler-Poinsot-polyhedra as the union of several objects and applies Euler's polyhedron formula on their number of vertices, edges and faces, than the result is two. This is also... 

24.10.2024, 16:15  –  2.09.0.14
Forschungsseminar Differentialgeometrie

Dominant energy condition and invertibility of the Dirac-Witten operator

Bernd Ammann (Regensburg)

The classical Atiyah-Singer theorem tells us: if is a closed spin manifold, carrying a metric of non-negative scalar curvature, then either the Dirac operator is invertible or ... 

23.10.2024, 10:15  –  2.09.0.14
Forschungsseminar: Gruppen und Operatoralgebren

An invitation to stable rank for C*-algebras

Jamie Bell (University of Münster)

Thanks to Gelfand duality, C*-algebras are often considered noncommutative topological spaces. A very profitable approach to studying C*-algebras is to formulate noncommutative generalisations of... 

23.10.2024, 14:00 - 15:00  –  Campus Golm, Building 10, Room 2.10.0.25
Informationsveranstaltung

Zentrale Arbeitsschutzunterweisung

Frau Zilm (Bereich Sicherheitswesen)

mehr erfahren

23.10.2024, 13:00  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

The unitary almost-Mathieu operator and (possibly) beyond.

Christopher Cedzich (Düsseldorf)

Abstract: In this talk, we introduce the unitary almost-Mathieu operator (UAMO) and discuss its connections to several model systems in physics and mathematics. We draw parallels to the self-adjoint... 

18.10.2024, 11:00  –  Campus Golm, Building 9, Room 2.22 and via Zoom
Arbeitsgruppenseminar Analysis

Weyl asymptotics for discrete pseudo-differential operators

Elke Rosenberger (Potsdam)

For a class of elliptic self-adjoint pseudo-differential operators in a discrete semi-classical setting we give asymptotic estimates for the number of eigenvalues in a fixed interval. Here we assume... 

18.10.2024, 10:15 - 11:45  –  2.28.0.108
SFB-Kolloquium

Scalable methods for Gaussian process regression

Botond Tibor Szabo, Università Bocconi, Italy

Gaussian processes (GP) are frequently used in Bayesian nonparametrics as a prior distribution on infinite dimensional functional parameters. However, even in case of the simple nonparametric... 

17.10.2024, 14:00 - 16:00  –  2.9.2.22
SFB-Seminar

Linear methods for non-linear inverse problems

Botond Tibor Szabo, Bocconi University, Italy

We consider recovering an unknown function f from a noisy observation of the solution u_f  to a partial differential equation of the type Lu_f  = c(f, u_f ) for a differential operator L, and invertible... 

17.10.2024, 16:15 Uhr  –  Raum 0.14
Forschungsseminar Differentialgeometrie

An equivariant index theorem on a Riemannian manifold.

Onirban Islam

For differential operators preserved by the action of a Lie group G, the notion of index generalises to the G-index. A prototype of this situation arises for spin-Dirac operators on a compact... 

16.10.2024, 10:15  –  2.09.0.14
Forschungsseminar: Gruppen und Operatoralgebren

Two groupoid C*-algebra constructions with the same name that we're not actually sure whether they're the same or not

Jonathan Taylor (UP)

Since Renault's reconstruction of Cartan pairs as (twisted) groupoid C*-algebras, later generalisations of the theory have partially diverged. Staying in the realm of C*-algebras with a 'large'... 

16.10.2024, 14:00 - 16:00  –  Campus Golm, Building 9, Room 2.22 and via Zoom
Institutskolloquium

Übungen: Konzepte und ihre praktische Umsetzung

Anke Lindmeier (Jena), Rolf Biehler (Paderborn)

14:00  Anke Lindmeier (Jena):  „Lehramtsaufgaben" in fachwissenschaftlichen Übungen: Vom Konzept zu Practices und ersten Wirkungsanalysen.
14:45  Tea and Coffee Break
15:15  Rolf Biehler (Paderborn): ... 

08.10.2024, 10:15 - 11:45  –  3.06.H02
Kálmán Lecture

Particle Methods in Machine Learning and Inverse Problems

Martin Burger, Helmholtz Imaging

7th Kálmán Lecture with Martin Burger

The use of methods resembling (interacting) particle systems has gained a lot of interest for different tasks in machine learning, inverse problems, and related... 

12.09.2024, 11:30 Uhr  –  Campus Golm, Haus 9, Raum 1.22 + Zoom
Verteidigung Masterarbeit / Master's Thesis Defence

MSc Verteidigung - Zerlegung eines Vektors in bedingte Summanden anhand von maximalen Flüssen auf Netzwerken

Luisa Herrmann (Uni Potsdam)

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29.07. bis 02.08.2024
Minikurs

Cancelled!

Lars Andersson

Lecture is cancelled!

25.07.2024, 16:30  –  Raum 0.14
Forschungsseminar Differentialgeometrie

Dirac eigenvalues, hyperspherical radius and applications

Christian Bär (UP)

I will explain an eigenvalue estimate for Dirac operators in terms of the hyperspherical radius of the underlying manifold. When combined with other known eigenvalue estimates this has a number of... 

19.07.2024, 10:15 - 11:30  –  2.28.0.108
SFB-Kolloquium

Is dispersion a stabilizing or destabilizing mechanism? Landau-damping induced by fast background flows

Edriss Titi , University of Cambridge

In this talk, I will present a unifed approach for the effect of fast rotation and dispersion as an averaging mechanism for regularizing and stabilizing certain evolution equations, such as the... 

18.07.2024, 16:15  –  Raum 1.10
Forschungsseminar Differentialgeometrie

Witten index and spectral shift function

Florian Hanisch

The spectral shift function is an object from scattering theory. It was invented to describe/compute traces of certain operators and generalizes the notion of spectral flow. It is moreover closely... 

11.07.2024, 16:15 Uhr  –  1.10
Forschungsseminar Differentialgeometrie

LEAN 4 proof assistant: first steps

Christoph Stephan

I will give an introduction to the Lean 4 proof assistant, focusing on basics of interactive theorem proving, dependend type theory and its applications in mathematics. The talk will be suitable for... 

10.07.2024, 14:00 - 16:00  –  Campus Golm, Building 9, Room 2.22 and via Zoom
Institutskolloquium

Group theory meets Hilbert spaces

Piotr Nowak (Warsaw), Adam Skalski (Warsaw)

14:00  Adam Skalski (Academy of Science, Warsaw):  Haagerup property: groups and operator algebras.
14:45  Tea and Coffee Break
15:15  Piotr Nowak (Academy of Science, Warsaw):  Rigidity results for... 

04.07.2024, 16:15  –  Raum 1.10 und per Zoom
Forschungsseminar Differentialgeometrie

Timelike Ricci bounds and Einstein's theory of gravity in a non smooth setting: an optimal transport approach

Andrea Mondino (Oxford)

Optimal transport tools have been extremely powerful to study Ricci curvature, in particular Ricci lower bounds in the non-smooth setting of metric measure spaces (which can be been as a non-smooth... 

03.07.2024, 10:15  –  Haus 9, Raum 2.22
Forschungsseminar: Gruppen und Operatoralgebren

Functoriality for groupoid C*-algebras

Jonathan Taylor (University of Potsdam)

Groupoid homomorphisms do not, generally, lift (functorially) to *-homomorphisms of the associated C*-algebras. The crux of this lies in the fact groupoids span a class of objects ranging from groups... 

02.07.2024, 16:15 Uhr  –  Raum 2.22, Haus 9 (Institut für Mathematik)
Informationsveranstaltung

Arbeitgeber stellen sich vor: Unternehmensberatung d-fine

Franziska Krüger (Senior Manager bei d-fine) & Max Lewandowski (Senior Consultant bei d-fine)

d-fine ist ein europäisches Beratungsunternehmen mit Fokus auf analytisch anspruchsvolle Themen, die von einem mathematisch-naturwissenschaftlich geprägten Team bearbeitet werden.  Franziska Krüger... 

28.06.2024, 14:30  –  Campus Golm Building 9 Room 2.22
Verteidigung Dissertation / PhD Defence

Algebraic Properties of Subsemigroup of the Symmetric Inverse Semigroup

Apatsara Sareeto

mehr erfahren

27.06.2024, 16:15  –  Raum 1.10
Forschungsseminar Differentialgeometrie

Fill-ins, Dirac eigenvalues and the hyperspherical radius

Christian Bär (UP)

Let be an n-dimensional closed Riemannian spin manifold. A fill-in of is a compact (n+1)-dimensional Riemannian spin manifold whose boundary is . If has nonnegative scalar... 

26.06.2024, 13:00 - 16:30  –  Campus Golm Haus 9 Raum 2.22
Workshop

MATH 4 MASTER

Mathematics by master students for master students.

Schedule: 

13:00 - Hans Riemann “A Novel Approach to Sequential Change Point Detection in Dynamical Systems - Investigations at an Origin of the... 

26.06.2024, 17:30 Uhr  –  Haus 25, Raum F1.01, Campus Golm
Antrittsvorlesung

Über die Zerlegung von Symmetrien diskreter Strukturen

Sven Raum

Ein Livestream zur Vorlesung wird zu gegebener Zeit auf der Webseite bereitgestellt.

26.06.2024, 11:00  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

A stability phase transition for cosmological fluids

David Fajman (Universität Wien)

Abstract:

Fluids are generally known to form shocks in finite time from small inhomogeneities. When the fluid evolves in an expanding spacetime, as in standard cosmology,

the expansion of spacetime... 

26.06.2024, 10:15  –  Haus 9, Raum 2.22
Forschungsseminar: Gruppen und Operatoralgebren

Higher Kazhdan projections and delocalised ℓ2-Betti numbers

Hang Wang (East China Normal University)

We introduce the K-theory class of higher Kazhdan projections and its relation with a variant of Lott's delocalised ℓ²-Betti numbers. We will also relate the K-theory class of higher Kazhdan... 

21.06.2024, 11:00  –  Campus Golm, Building 9, Room 2.22 and via Zoom
Arbeitsgruppenseminar Analysis

When the Lie group exponential is bad

Alexander Schmeding (Trondheim) via ZOOM

From finite dimensional Lie theory, it is well known that the Lie group exponential yields a local diffeomorphism from the Lie algebra onto a unit neighborhood of the Lie group. These exponential... 

20.06.2024, 16:15  –  Raum 1.10
Forschungsseminar Differentialgeometrie

Green Operators on Static Spacetimes with Timelike Boundary

Onirban Islam

I shall introduce the Chazarain method to construct retarded and advanced Green operators for a Dirac operator on a globally hyperbolic spacetime with timelike boundary.

20.06.2024, 15:00 Uhr  –  Haus 25, Raum B0.01 Campus Golm
Forschungsseminar Mathematische Physik

Courant or Pleijel theorems for Hörmander's operators

Bernard Helffer

This is a hybrid talk. For Zoom login data please contact Elke Rosenberger.

19.06.2024, 16:30 Uhr  –  Haus 10, Raum 0.25
Institutsveranstaltung

Absolventenfeier des Instituts für Mathematik

mehr erfahren

19.06.2024, 17:30 Uhr  –  Grillplatz neben der Mensa (Campus Golm)
Institutsveranstaltung

Institutsfest des Instituts für Mathematik

Public Viewing: Das EM-Spiel läuft ab 18:00 Uhr auf großem Bildschirm!

14.06.2024, 10:15 - 11:30  –  2.28.0.108
SFB-Kolloquium

Random walks of heterogeneous population and ensemble self-reinforcement

Sergei Fedotov, University of Manchester

The talk will be concerned with time-fractional master equations with random transition probabilities describing a heterogeneous population of random walkers. This formulation leads to an effective... 

14.06.2024, 11:00 Uhr  –  Campus Golm, Building 9, Room 2.22 and via Zoom
Arbeitsgruppenseminar Analysis

Universal central extensions of the Lie algebra of volume-preserving vector fields

Leonid Ryvkin (Lyon)

The goal of the talk is proving a conjecture of Claude Roger about the universal central extension of the Lie algebra of volume-preserving vector fields. In the beginning we will briefly review the... 

05.06.2024, 14:00 - 16:00  –  Campus Golm, Building 9, Room 2.22 and via Zoom
Institutskolloquium

Variational problems for knotted curves and surfaces: how repulsive energies come into play

Heiko von der Mosel (University of Aachen), Henrik Schumacher (University of Georgia)

14:00  Heiko von der Mosel (University of Aachen):  On the Tangent-Point Energy.
14:45  Tea and Coffee Break
15:15  Henrik Schumacher (University of Georgia):  Numerical Optimization of the... 

05.06.2024, 10:15  –  Raum 2.22, Haus 9
Forschungsseminar: Gruppen und Operatoralgebren

Propagating the algebraicity of automorphic representations via functoriality

Wushi Goldring (Stockholm University)

My talk concerns the algebraic properties of automorphic representations. These infinite-dimensional representations of reductive groups over number fields are defined using harmonic analysis.... 

04.06.2024, 16:15 Uhr  –  Raum 2.22, Haus 9 (Institut für Mathematik)
Informationsveranstaltung

Praktikum bei KPMG: Ein Erfahrungsbericht

Kolja Wichmann

Kolja Wichmann hat nach seiner Bachelorarbeit ein Praktikum bei KPNG gemacht und arbeitet jetzt parallel zu seinem Masterstudium bei KPMG in Teilzeit. Er wird kurz (20-30 Minuten) über sein Praktikum... 

31.05.2024, 14:00 Uhr  –  Raum 2.22, Haus 9 (Institut für Mathematik)
Verteidigung Dissertation / PhD Defence

Hardy Inequalities on Graphs

Florian Fischer

Disputation zur Dissertation "Hardy Inequalities on Graphs" aus der Wissenschaftsdisziplin Diskrete Mathematik.

31.05.2024, 11:00  –  Campus Golm, Building 9, Room 2.22 and via Zoom
Arbeitsgruppenseminar Analysis

From the Mini-Max principle to the geometry of Newton polyhedra

Luisa Herrmann (Uni Potsdam)

We will introduce the notion of Newton polytope and then prove  a result on normal vectors to polyhedra built from Newton polytopes. For this we follow a proof by Thierry Champion using the Mini-Max... 

29.05.2024, 14:00 - 16:00 (Special session)  –  Campus Golm, Building 9, Room 2.22 and via Zoom
Institutskolloquium

Mathematical structures from studying and counting points

Abhiram Kidambi (Leipzig), Noah Arbesfeld (Vienna)

14:00  Abhiram M. Kidambi (MPI, Leipzig):  Computer assisted number theory: Past, Present and Future.
14:45  Tea and Coffee Break
15:15  Noah Arbesfeld (University of Vienna):  Structures from points... 

29.05.2024, 13:00  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

Quantum information scrambling and chaos induced by a Hermitian matrix (joint work with Uzy Smilansky)

Sven Gnutzmann

Abstract: Given an arbitrary Hermitian matrix, considered as a finite discrete quantum Hamiltonian, we use methods from graph and ergodic theories to construct a corresponding unitary scattering... 

28.05.2024, 11:00 Uhr (exceptionally)  –  Campus Golm, Building 9, Room 0.13 and via Zoom
Arbeitsgruppenseminar Analysis

On the homotopy invariance of Lie algebroid cohomology

Rosa Marchesini (Göttingen)

Several extensively studied cohomology theories play an important role in differential geometry and mathematical physics. Examples are De Rham cohomology, Chevalley-Eilenberg cohomology, BRST... 

24.05.2024, 11:00 Uhr  –  Campus Golm, Building 9, Room 2.22 and via Zoom
Arbeitsgruppenseminar Analysis

Cotangent spaces for higher Lie groupoids and applications

Stefano Ronchi (Göttingen)

In the same way Lie groupoids can encode local symmetries of a manifold, Lie 2-groupoids are a way to encode higher symmetries. After a short crash course on this topic, we present the construction of... 

24.05.2024, 10:00 - 11:30  –  2.9.1.22
SFB-Seminar

Reconstruction of electron radiation belts using numerical modeling, data assimilation and machine learning

Alexander Drozdov, University of California, Los Angeles

This seminar presented an overview of numerical modeling, data assimilation, and machine learning in understanding Earth's electron radiation belts. Central to the discussion is the Versatile Electron... 

24.05.2024, 13:00 Uhr  –  Campus Golm, Building 9, Room 2.22 and via Zoom
Arbeitsgruppenseminar Analysis

A leisurely stroll through the multisymplectic approach to Lagrangian field theories (continued)

Fabrizio Zanello (Universität Potsdam)

The mathematical toolbox of multysimplectic geometry was introduced in order to generalize the symplectic formulation of classical mechanics to Lagrangian field theories. After a substantial body of... 

24.05.2024, 14:30 Uhr  –  Auditorium Maximum im Haus 8, Am Neuen Palais
Ankündigung

Euler-Vorlesung 2024

Alessio Figalli und Clara Silvia Roero

Die Euler-Vorlesung in 2024 wird von dem Mathematiker Alessio Figalli von der ETH Zürich gehalten. Den traditionellen historischen Vortrag wird die Mathematikerin Clara Silvia Roero von der Univerität... 

23.05.2024, 16:15  –  Raum 1.10
Forschungsseminar Differentialgeometrie

Transgressions of Characteristic Classes

Alberto Richtsfeld (UP)

In this talk I will report on my progress in computing the transgression forms for characteristic classes. First, I will compute the transgression form of characteristic classes of power sum symmetric... 

22.05.2024, 10:15  –  Raum 2.22, Haus 9
Forschungsseminar: Gruppen und Operatoralgebren

Spectral triples for group C*-algebras from geometric group theory

Ada Masters (University of Wollongong)

Since Connes’s 1989 paper, the use of length functions to build spectral triples for group C*-algebras has become commonplace in noncommutative geometry. This construction, although sound at the level... 

17.05.2024, 10:15 - 11:30  –  2.28.0.108
SFB-Kolloquium

Kernel Methods in Generative Modeling

Gabriele Steidl, TU Berlin

We consider gradient flows with respect to the maximum mean discrepancy (MMD) of certain kernels. For the efficient computation, we propose slicing techniques that restrict the kernel evaluations to... 

17.05.2024  –  Raum 3.06.H01, Griebnitzsee
Workshop

BB-workshop III: Knot theory and its Applications

This is a one-day workshop aiming to bring together researchers and students from the Universities of Berlin and Brandenburg.

It is an opportunity to discover the latest advancements in research in... 

17.05.2024, 11:00 Uhr  –  Campus Golm, Building 9, Room 2.22 and via Zoom
Arbeitsgruppenseminar Analysis

A leisurely stroll through the multisymplectic approach to Lagrangian field theories

Fabrizio Zanello (Universität Potsdam)

The mathematical toolbox of multysimplectic geometry was introduced in order to generalize the symplectic formulation of classical mechanics to Lagrangian field theories. After a substantial body of... 

16.05.2024, 16:15  –  Raum 1.10
Forschungsseminar Differentialgeometrie

Rigidity of initial data sets in Minkowski space

Christian Bär (UP)

If M is a spacelike hypersurface of a Lorentzian manifold, then M inherits an induced Riemannian metric g and a second fundamental form q. The triple (M,g,q) is then called the induced initial data... 

15.05.2024, 14:00 - 16 00  –  Campus Golm, Building 9, Room 2.22 and via Zoom
Institutskolloquium

Operator algebras and their classification

Karen Strung (Czech Academy of Science, Prague), Sven Raum (Potsdam)

14:00  Karen Strung (Czech Academy of Science, Prague):  Operator algebras arising from topological dynamics.
14:45  Tea and Coffee Break
15:15  Sven Raum (Uni Potsdam):  Operator algebras from... 

10.05.2024, 11:00 Uhr  –  Campus Golm, Building 9, Room 2.22 and via Zoom
Arbeitsgruppenseminar Analysis

On a problem of optional transport under marginal martingale constraints

Luisa Herrmann (Universität Potsdam)

Based on an article by Mathias Beigelböck and Nicolas Juillet, I will first describe the martingale version of the optimal transport problem after which I will define the convex order and give some... 

10.05.2024, 14:15  –  Haus 9, Raum 2.22
Forschungsseminar: Gruppen und Operatoralgebren

The Levi-Civita connection on noncommutative differential forms

Adam Rennie (University of Wollongong)

I will discuss the main results and consequences of recent workwith Bram Mesland. Using mostly algebraic techniques, with just a littleHilbert module analysis, we present necessary and sufficient... 

08.05.2024, 13:00  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

Anti-Faber-Krahn property for the heat content on metric graphs (or “Building better batteries”)

Matthias Täufer (Hagen)

Abstract: We speak about the heat content at time t on metric graphs. This quantity measures how much mass of a constant initial configuration remains in the graph at time t under the action of the... 

03.05.2024, 10:30  –  Zoom (email us to get the link if you are interested)
Forschungsseminar Statistik

Information Percolation for reconstruction problems on graphs

Luca Ganassali (Universite Paris Saclay)

We propose a method of proving impossibility results based on applying strong data-processing inequalities to estimate mutual information between sets of variables forming certain Markov random... 

03.05.2024, 11:00 Uhr  –  Campus Golm, Building 9, Room 2.22 and via Zoom
Arbeitsgruppenseminar Analysis

Construction of marginally outer trapped surfaces

Alejandro Peñuela Díaz (Universität Potsdam)

In physics, marginally outer trapped surfaces (MOTS) can be understood as quasi-local versions of black hole boundaries. Therefore, these surfaces are crucial to understand black holes and are widely... 

26.04.2024, 15:00  –  2.09.0.14
Forschungsseminar: Gruppen und Operatoralgebren

Properties of affine cellular algebras

Christian Lomp (University of Porto)

Motivated by Lusztig's basis of Hecke algebras, Graham and Lehrer introduced cellular algebras in 1996. As a generalisation of Graham and Lehrer’s cellular algebras, affine cellular algebras have been... 

26.04.2024, 11:00 Uhr  –  Campus Golm, Building 9, Room 2.22 and via Zoom
Arbeitsgruppenseminar Analysis

Convergence results in the stochastic sine-Gordon model: an algebraic viewpoint

Alberto Bonicelli (Pavia, Italy)

The importance of the sine-Gordon model in 1+1 spacetime dimensions resides in the integrability of the field theory that it describes. A recent result showed how, within the setting of algebraic... 

26.04.2024, 10:30  –  Zoom (please email us to get the link if you are interested
Forschungsseminar Statistik

Change point in the preferential attachement model

Ibrahim Kaddouri (Universite Paris Saclay)

Motivated by the problem of detecting a change in the evolution of a
network, we consider the preferential attachment random graph model with
a time-dependent attachment function. Our goal is to... 

25.04.2024, 16:15  –  Raum 1.10
Forschungsseminar Differentialgeometrie

Atiyah-Singer-Indexsatz

Lennart Ronge (UP)

Vorbereitung auf das Blockseminar "Geometrie" nach dem Inverted-Classroom-Prinzip.
Indexsatz, Chern-Klassen, Pontrjagin-Klassen (3.4 - 4.3.7 im Skript)

24.04.2024, 14:00 - 15:00  –  Campus Golm, Building 5, Room 2.05.0.01
Informationsveranstaltung

Zentrale Arbeitsschutzunterweisung

Frau Zilm (Bereich Sicherheitswesen)

mehr erfahren

24.04.2024, 15:00 - 17:30  –  2.9.1.22
SFB-Seminar

A time-adaptive optimal control approach for 4D-var data assimilation problems governed by parabolic PDEs

Jannis Marquardt, TU Braunschweig

Seminar talk followed by a young researcher network meeting.

Abstract:

The common solution techniques of the data assimilation problem typically require the numerical treatment of large systems.... 

24.04.2024, 14:00 Uhr  –  2.05.0.01
Institutsveranstaltung

Arbeitsschuzunterweisung

Stefanie Zilm

Für alle Mitarbeiterinnen und Mitarbeiter des Instituts für Mathematik ist jährlich eine Arbeistsschutzunterweisung verpflichtend. Bitte sprechen Sie es mit Ihren Vorgesetzten ab, dass Sie diesen... 

22.04.2024, 10:30  –  Room 2.09.2.22
Verteidigung Masterarbeit / Master's Thesis Defence

Computational optimization of ideal weaves

Juliane Harnisch

mehr erfahren

19.04.2024, 11:00 Uhr  –  Campus Golm, Building 9, Room 2.22 and via Zoom
Arbeitsgruppenseminar Analysis

Free generators and Hoffman's isomorphism for the two-parameter shuffle algebra

Leonard Schmitz (MPI Leipzig)

Signature transforms have recently been extended to data indexed by two and more parameters. With free Lyndon generators, ideas from B∞-algebras and a novel two-parameter Hoffman exponential, we... 

19.04.2024, 10:30  –  Zoom
Forschungsseminar Statistik

Optimal Stratification Learning: Clustering-by-dimensionality with reconstruction

Clément Berenfeld (UP)

Given i.i.d. random variables drawn from a mixture of immersed low-dimensional submanifolds of different dimensions, we study the minimax estimation of the family of submanifolds in Hausdorff... 

18.04.2024, 16:15  –  Raum 1.10
Forschungsseminar Differentialgeometrie

Spinstrukturen und Dirac-Operator

Christian Bär (UP)

Vorbereitung auf das Blockseminar "Geometrie" nach dem Inverted-Classroom-Prinzip.

2.4-2.5.11, 2.5.17-18, Thm 5.1.1 im Skript

17.04.2024, 13:00  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

Zero measure Cantor spectrum for Sturmian metric graphs

Gilad Sofer (Technion)

Abstract: A classical result by Belissard et al states that the spectrum of a 1-dimensional Hamiltonian with a Sturmian potential is a singular continuous Cantor set of Lebesgue measure zero. More... 

17.04. bis 17.04.2024, 10:15  –  room 2.22, house 9
Forschungsseminar: Gruppen und Operatoralgebren

Duality principles for frames and Riesz sequences via Morita equivalence

Ulrik Enstad

Frames provide a robust notion of infinite spanning sequences in a Hilbert space. Dually, a Riesz sequence is a strong type of linearly independent sequence. The frame property of certain structured... 

12.04.2024, 10:15 - 11:30  –  2.28.0.108
SFB-Kolloquium

SFB Colloquium with Ulrike Herzschuh & Thomas Laepple

Ulrike Herzschuh & Thomas Laepple, Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research

tba

12.04.2024, 9:30 Uhr (Note the unusual time!)  –  Campus Golm, Building 9, Room 2.22
Arbeitsgruppenseminar Analysis

On manifolds of Lie group valued continuous BV-functions

Alexander Schmeding (NTNU, Trondheim)

Functions of bounded variation (BV) with values in a Banach space are a classical topic of analysis with specific applications for example in rough path theory. In the theory of rough paths one... 

11.04.2024, 16:15  –  Raum 1.10
Forschungsseminar Differentialgeometrie

Algebraische Grundlagen der Spingeometrie

Christian Bär (UP)

Vorbereitung auf das Blockseminar "Geometrie" nach dem Inverted-Classroom-Prinzip.
Clifford-Algebren, Spingruppe, Spinoren (2.1-2.3 im Skript)

10.04.2024, 14:00 - 16:00  –  Campus Golm, Building 9, Room 2.22 and via Zoom
Institutskolloquium

A glimpse into the world of quantum computing and programming

Bettina Just (Gießen), Dominique Unruh (Aachen)

14:00  Bettina Just (Gießen):  Some Basics of Quantum computing.
14:45  Tea and Coffee Break
Zoom 15:15  Dominique Unruh (Aachen):  Quantum Hoare Logic ... and Ghosts.

Bettina Just (Gießen):  Some... 

10.04.2024, 10:15 - 11:15  –  Haus 9, Raum 2.22
Forschungsseminar: Gruppen und Operatoralgebren

Relatively free trioids

Anatolii Zhuchok (Luhansk Taras Shevchenko National University, Poltava, Ukraine)

A trioid is an algebraic system consisting of a set with three binary associative operations satisfying certain axioms. Trioids are a generalization of semigroups. They play a prominent role in... 

10.04.2024, 13:00  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

Effects of time-reversal invariance violation in quantum graphs.

Pavel Exner (Prague)

Abstract: The topic of this talk are quantum graphs with the vertex coupling which does not preserve the time-reversal invariance. As a case study the simplest example with the asymmetry being maximal... 

21.03. bis 22.03.2024  –  Haus 9, Neues Palais, Potsdam (room 1.14, room 1.15)
Workshop

Workshop of FOR 5381 (statistics and machine learning)

This workshop is organised in the setting of the FOR 5381 project on Mathematical Statistics in the Information age, and will be broadly on statistical efficiency and computational tractability.

Here... 

21.03.2024, 16:15  –  Raum 1.22
Forschungsseminar Differentialgeometrie

Investigating Fredholm properties of Lorentzian Dirac operators with boundary conditions

Lennart Ronge (UP)

Given a Dirac operator on a Lorentzian manifold with timelike boundary, its Fredholm index (and whether it is Fredholm at all) heavily depends on the boundary conditions that one imposes on the... 

28.02.2024, 16:00  –  Campus Golm, Building 28, Room 0.102
SIAM Student Chapter Seminar for Early Career Researchers

The Mysterious Motility of Microorganisms

Agniva Datta, Jan Albrecht

First Presentation

Speaker: Agniva Datta

Topic: The mysterious motion of swimming bacteria: a bridge connecting biology and non-equilibrium physics

Abstract: 

From the mesmerizing patterns formed by... 

20.02. bis 21.02.2024  –  Haus 9, Neues Palais, Potsdam (room 2.03)
Workshop

3rd ASCAI Workshop (statistics and machine learning)

This workshop is organised in the setting of of the ASCAI project and is on batch and sequential unsupervised learning.

Here is the schedule of the workshop.

For more information on the ASCAI-Project... 

16.02.2024, 09:00 - 10:00  –  2.9.1.22
SFB-Seminar

Exploiting Independence for Optimal Gaussian Importance Sampling

Stefan Heyder, TU Ilmenau

Importance sampling is a Monte Carlo technique that estimates posterior expectations in Bayesian computation by sampling from a tractable proposal distribution instead of the intractable posterior.... 

14.02.2024, 12:00 – 14:00 Uhr  –  Campus Golm, Haus 25, Raum F1.01
Öffentlicher Vortrag

Lunch Talks: "Women in Science - Hinter den Kulissen"

(English? click here) (Flyer der Veranstaltung)

Hinter wissenschaftlichen Ergebnissen stehen oft mehr Beteiligte als die, deren Namen sichtbar sind. Damit Forschung gelingt, muss das Umfeld stimmen,... 

14.02.2024, 12 – 2 pm  –  Campus Golm, Haus 25, Room F1.01
Öffentlicher Vortrag

Lunch Talks: "Women in Science - Behind the Scenes"

(Deutsch? Hier klicken) (Event Flyer)

Scientific results are often the result of a team work which involves more people than those whose names are visible. A favourable environment contributes to... 

12.02. bis 16.02.2024  –  University of Potsdam, Campus Golm
Konferenz

Microlocal and Global Analysis, Interactions with Geometry

The meeting is part of a series of meetings initiated by Professor Schulze devoted to micro-local, singular and global analysis and their interactions with geometry and mathematical physics.

Conferenc... 

09.02.2024, 11:00  –  Campus Golm, Room 2.22, Building 9 (and Zoom)
Arbeitsgruppenseminar Analysis

The Semiclassical Einstein Equations and the Stability of Linearized Solutions

Paolo Meda (U. Pavia) - Online

The semiclassical formulation of gravity is discussed in the framework of algebraic quantum field theory in curved spacetimes. The main topic of the talk is the Semiclassical Einstein Equations, which... 

08.02.2024, 16:00  –  Haus 9, Raum 0.14
Forschungsseminar Differentialgeometrie

Eta invariants of the Berger spheres

Rebecca Roero

Presentation of an innovative way to compute the eta invariants for the Dirac operator of the Berger spheres. We can use the Atyiah-Patodi-Singer theorem for the index of the classical Dirac operator... 

08.02.2024, 10:15 - 11:15  –  2.05.5.05 (changed!)
Forschungsseminar: Gruppen und Operatoralgebren

Cartan Semigroups

Tristan Bice (Czech Academy of Sciences)

Cartan subalgebras allow C*-algebras to be represented on effective twisted étale groupoids by utilising key properties of their normaliser semigroup.  Isolating these key properties, we formulate an... 

07.02.2024, 10:15  –  2.09.0.12
Forschungsseminar: Gruppen und Operatoralgebren

Semiprime ideals in C*-algebras

Hannes Thiel (Chalmers)

Nonclosed ideals of bounded operators play a prominent role in the theory of singular traces as developed by Dixmier, Connes and many others, and the Calkin correspondence is a powerful tool that can... 

02.02.2024, 10:15 - 11:15  –  room 0.108, building 28
SFB-Kolloquium

From Neurons to Symbolic Representation and Rapid Learning in Mind and Brain: A Brain-Constrained Neural Model

Rosario Tomasello, FU Berlin

To grasp the meaning of words and their relationship to the outside world, higher cognitive processes unique to the human brain are at work. However, despite decades of research on the neural... 

02.02.2024, 11:00  –  Campus Golm, Building 9, Room 2.22 and Zoom
Arbeitsgruppenseminar Analysis

Constraint Geometry and Reduction of Dirac Geometry

David Kern (U. Göttingen)

In this talk we first motivate constraint geometry by recalling Poisson geometry. Afterwards we introduce constraint manifolds as well as constraint vector bundles and prove a constraint Cartan... 

31.01.2024, 13:00  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

Deducing properties of graphs from their C*-algebras (and vice versa)

Jonathan Taylor (UP)

Abstract: Given a directed row-finite graph, one may define representations of such a graph in C*-algebras and deduce the existence of a unique C*-algebra that is universal for such representations.... 

30.01.2024, 12:15 - 13:30  –  2.9.2.22
SFB-Seminar

Computing Spectra of Infinite-dimensional operators - what do we need?

Catherine Drysdal, University of Birmingham

In this talk, I look at two examples regarding the numerical computation of spectra for infinite-dimensional non-self-adjoint operators. Two conditions are need to compute the spectrum of operators in... 

26.01.2024, 11:00  –  Zoom Meeting
Arbeitsgruppenseminar Analysis

The free tracial pre-Lie-Rinehart algebra

Dominique Manchon (Clermont-Ferrand) - Online

Tracial Lie-Rinehart algebras are a purely algebraic version of finite-dimensional Lie algebroids, for which the trace is given fibrewise. A tracial Lie-Rinehart algebra is pre-Lie if moreover both... 

24.01.2024, 14:00 - 16:00  –  Campus Golm, Building 9, Room 2.22 and via Zoom
Institutskolloquium

Analytic methods in Geometry: Quantum limits and H-infinity functional analysis.

Véronique Fischer (Bath), Lashi Bandara (Deakin Uni, Melbourne)

14:00 Véronique Fischer (Bath): Sub-Riemannian quantum limits.
14:45 Tea and Coffee Break
15:15 Lashi Bandara (Deakin Uni, Melbourne): Functional calculus, garnished with a little geometry.

Abstracts:
... 

22.01.2024, 14:15 - 17:15  –  Campus Golm, Haus 9, Raum 2.22
Minikurs

Locally perturbed random walks II

Andrey Pilipenko (Nat. Acad. of Sciences & Nat. TU of Ukraine, Kyiv)

This will be the second and last part of a mini-course on locally perturbed random walks and their limits after normalisation.

Prerequisite: a first course of Probability theory (+ measure theory).

Ev... 

22.01.2024, 15:30  –  Online
Arbeitsgruppenseminar Analysis

Meromorphic functions and projective embeddings of abelian varieties

Kamal Khuri Makdisi (AUB, Beirut)

Colloquium "Mathematics in Lebanon and beyond"

A -dimensional abelian variety over the complex numbers is a special kind of complex torus , where is a lattice of rank . The... 

18.01.2024, 16:00  –  Raum 14, Haus 9
Forschungsseminar Differentialgeometrie

Positive mass theorems and distance estimates for spin initial data sets

Rudolf Zeidler (Münster)

We will present variants of the spacetime positive mass theorem in the spin setting: Firstly, its conclusion holds for a single asymptotically flat (AF) end in a spin initial data set... 

17.01.2024, 15:30  –  Campus Golm, Building 9, Room 2.22
Institutskolloquium

Metric inequalities under lower scalar curvature bounds

Rudolf Zeidler (University of Münster)

We will discuss situations where a lower bound on the scalar curvature of a Riemannian manifold leads to a quantitative distance estimate as well as corresponding rigidity results. The study of these... 

15.01.2024, 14:15 - 17:15  –  Campus Golm, Haus 9, Raum 2.22
Minikurs

Locally perturbed random walks I

Andrey Pilipenko (Nat. Acad. of Sciences & Nat. TU of Ukraine, Kyiv)

This will be the first part of a mini-course on locally perturbed random walks and their limits after normalisation.

Prerequisite: a first course of Probability theory (+ measure theory).

For more... 

12.01.2024, 10:15 - 11:15  –  2.28.0.108
SFB-Kolloquium

Statistical analysis of SPDEs – exploring singularities

Igor Cialenco, Illinois Institute of Technology

Unlike traditional finite-dimensional stochastic differential equations, statistical models driven by SPDEs are predominantly singular, when the solution is observed on a finite time interval. Hence,... 

12.01.2024, 11:00  –  Campus Golm, Potsdam, building 09, room 2.22
Arbeitsgruppenseminar Analysis

Singular SPDEs on Geometric Spaces

Harprit Singh (Edinburgh)

Abstract:
We shall discuss the solution theory to a large class of singular SPDEs in various non-translation invariant settings. In particular, I shall present results on Riemannian manifolds and... 

11.01.2024, 11:00  –  Only ONLINE
Forschungsseminar Wahrscheinlichkeitstheorie

On the generalized Skorokhod reflection problem

Andrey Pilipenko (Nat. Acad. of Sciences & Nat. TU of Ukraine, Kyiv)

The Skorokhod reflection was used in 1961 to create a reflected Brownian motion on the half-line. Later, it was used for processes with jumps such as reflected Lévy processes. Like a Brownian motion,... 

11.01.2024, 16:00  –  Haus 9, Raum 0.14
Forschungsseminar Differentialgeometrie

Hodge theorem for rough metrics

Lashi Bandara

In this talk, I will discuss the Hodge theorem in the context of rough metrics (locally bounded measurable coefficient metrics). This is work in progress with Georges Habib (Beirut).

15.12.2023, 10:15 - 11:15  –  2.28.0.108
SFB-Kolloquium

Uncertainty Quantification and Attribution in Models of the Earth System

Thorsten Wagner, University of Potsdam

The recent State of Global Water Resources report by the World Meteorological Organization concluded that the hydrological cycle is spinning out of balance due to climate change and human activities.... 

15.12.2023, 11:00  –  Campus Golm, Building 9, Room 2.22
Arbeitsgruppenseminar Analysis

The stochastic Ebin-Marsden toolbox

Alexander Schmeding (NTNU, Trondheim)

Abstract:

Due to an idea by V. Arnold, certain partial differential equations (PDE) can be rewritten as ordinary differential equations (ODE) on infinite-dimensional manifolds.
One of the most... 

14.12.2023
Berlin-Brandenburgisches Seminar Mathematik und ihre Didaktik

mehr erfahren

14.12.2023, 16:00  –  Room 0.14, House 9
Forschungsseminar Differentialgeometrie

Rigidity for initial data sets and spacetimes

Jonathan Glöckle (Regensburg)

Initial data sets are pairs of a Riemannian metric and a symmetric 2-tensor on a manifold . They arise in General Relativity as induced Riemannian metric and induced second fundamental form,... 

13.12.2023, 14:00  –  Campus Golm, Building 9, Room 2.22
Institutskolloquium

Exploring the International Mathematical Union

Norbert Schappacher (Strasbourg), Marie-Françoise Roy (Rennes)

2-2:45pm: Framing Global Mathematics.
The International Mathematical Union between Theorems and Politics
Norbert Schappacher (Strasbourg)

Abstract:
I will present examples that show how national and... 

12.12.2023, 16:00  –  Zoom talk
Forschungsseminar Wahrscheinlichkeitstheorie

On the tradeoff between almost sure convergence and overshoot integrability with applications

Michael Högele (Univ. de los Andes, Kolumbien)

In this talk we present a quantitative version of the Borel-Cantelli lemma, which allows for a quantification of the "tradeoff" between a.s. rates of convergence and the precise integrability of the... 

08.12.2023, 11:00  –  Campus Golm, Building 9, Room 2.22, (and per Zoom)
Arbeitsgruppenseminar Analysis

A Poincaré formula for differential forms and applications

Georges Habib (Lebanese University, Beirut)

Abstract:

We  prove a new general Poincaré type inequality for differential forms on compact Riemannian manifolds with nonempty boundary.
When the boundary is isometrically immersed in Euclidean... 

07.12.2023, 13:00  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

Markov chains arising from graphs over ordered fields

Anna Muranova (University of Warmia and Mazury in Olsztyn)

Abstract: In this talk we consider graphs, whose weights belong to an ordered field. It is known, that in the case of real weights every weighted graph defines a Markov chain, whose states are... 

07.12.2023, 10:30  –  Weierstrass Inst., Berlin
Forschungsseminar Wahrscheinlichkeitstheorie

Invariant integrated convexity profiles for Hamilton-Jacobi-Bellman equations and applications.

Giovanni Conforti (Ecole Polytechnique, Paris)

It has been known for a long time that Hamilton-Jacobi-Bellman (HJB) equations preserve convexity, namely if the terminal condition is convex, the solution stays convex at all times. Equivalently,... 

06.12. bis 06.12.2023, 10:15  –  Campus Golm, Haus 9, Raum 2.22
Verteidigung Masterarbeit / Master's Thesis Defence

Random Walks On Finite Group: Cutoff For Card Shuffles

Mohamed Belkasim

mehr erfahren

06.12.2023, 11:00  –  Campus Golm, Haus 9, Raum 0.17
Verteidigung Masterarbeit / Master's Thesis Defence

Evolutionary Graph Theory

Mert Ugurlu

Evolutionary Graph Theory extends the Moran-Process of Population Genetics to a random process where the population has some structure. A typical question is for fixation when a new mutant allele... 

06.12.2023, 13:00  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

An embedded trace theorem for infinite metric trees with applications to transmission problems with mixed dimensions.

Konstantin Pankrashkin (Carl von Ossietzky Universität Oldenburg)

Abstract: For a class of weighted infinite metric trees we propose a definition of the boundary trace which maps H^1-functions on the tree to L^2-functions on a compact Riemannian manifold. For a... 

01.12.2023, 11:00  –  Campus Golm, Building 9, Room 2.22
Arbeitsgruppenseminar Analysis

Post-Lie algebra of derivations and regularity structures

Jean-David Jacques (Potsdam)

Abstract:

Post-Lie algebra structures are a generalization of Pre-Lie algebras. They have their roots in geometry and correspond to the algebraic properties satisfied by the covariant derivative in... 

30.11.2023, 16:00  –  Haus 9, Raum 0.14
Forschungsseminar Differentialgeometrie

Variation of the analytic torsion of the perturbed Laplace operator on a manifold with boundary.

Ihsane Malass

Ray and Singer proved that on a closed manifold the analytic torsion is independent of the choice of Riemannian metric and on a compact manifold with boundary under relative / absolute boundary... 

24.11.2023, 10:15 - 11:15  –  room 0.108, building 28
SFB-Kolloquium

Discretization-adaptive regularization of inverse problems

Tim Jahn

We consider linear inverse problems under white (non-Gaussian) noise. For the solution we have to discretize the problem, and we consider a sequence of discretization schemes with increasing... 

24.11.2023, 11 Uhr  –  Campus Golm, Building 9, Room 2.22
Arbeitsgruppenseminar Analysis

Higher currents for the sine-Gordon model in perturbative Algebraic Quantum Field Theory

Fabrizio Zanello (Univ. Potsdam)

Title:

Higher currents for the sine-Gordon model in perturbative Algebraic Quantum Field Theory


Abstract:

First, we review the 2-dimensional sine-Gordon model in Classical Field Theory and derive... 

24.11.2023, 10:00  –  Campus Golm, Haus 9, raum 1.22
Arbeitsgruppenseminar Angwandte Geometrie und Topologie

Seminar: A galaxy of periodic tilings

Prof. Dr. Daniel Huson (University of Tübingen)

Abstract: This talk has four parts. In the first part - topology -, we recall the classification of two dimensions manifolds and orbifolds, and introduce their Conway notation. In the second part -... 

23.11.2023, 16:00  –  Haus 9, Raum 0.14
Forschungsseminar Differentialgeometrie

Parameter optimization in modeling static deformations of elastic membranes with TensorFlow 2.0

Claudia Grabs

The solution of a boundary value problem for static deformations of hyperelastic membranes depends on some constant material parameters describing the elastic properties of the material. These can be... 

22.11.2023, 14:00 - 16:00 Uhr  –  Campus Golm, Building 9, Room 2.22 and via Zoom
Institutskolloquium

Information geometry

Lorenz Schwachhöfer (TU Dortmund), Nihat Ay (TU Hamburg)

14:00 Lorenz Schwachhöfer (TU Dortmund)

14:45 Tea and Coffee Break

15:15 Nihat Ay (TU Hamburg)

Lorenz Schwachhöfer (TU Dortmund): Information Geometry in the classical and quantum setting

Abstract:In... 

20.11.2023, 15:30  –  online
Colloquium

Deriving quantitative estimates on random matrices using free probability tools

Marwa Banna (New York University Abu Dhabi)

Abstract: In this talk, I start with a brief introduction to random matrices and free probability theory and highlight the connection between the two domains. I will then show how free probability... 

17.11.2023, 11 Uhr  –  Room 2.22 of the mathematics building (Haus 9)
Arbeitsgruppenseminar Analysis

Boundary value problems for loaded partial differential equations with the classical and nonclassical operators

Umida Baltaeva (Uzbekistan Academy of Sciences)

Title: Boundary value problems for loaded partial differential equations with the classical and nonclassical operators

Abstract: I will introduce loaded equations and their applications to applied... 

16.11.2023, 16:00  –  Haus 9, Raum 0.14
Forschungsseminar Differentialgeometrie

Microlocalisation on a manifold with boundary-II

Onirban Islam

Loosely speaking, if two (pseudo)differential operators differ only by smoothing operators then they are called microlocal conjugate to each other. It is a classic result by Duistermaat and Hörmander... 

16.11.2023, 10:15 - 11:45  –  room 2.22, building 9
SFB-Seminar

Nonparametric classification with missing data

Torben Sell, University of Edinburgh

Missing data are ubiquitous in modern statistics, posing a major challenge in a plethora of applications. In the first half of the talk, I will firstly introduce the general missing data problem and... 

16.11. bis 16.11.2023, 10:15 - 11:45  –  Online
Forschungsseminar: Gruppen und Operatoralgebren

Long thin covers and finite nuclear dimension for crossed product C*-algebras

Jianchao Wu (Fudan University)

Finite nuclear dimension is a regularity property of C*-algebras that have played a pivotal role in the Elliott classification program of C*-algebras. It has been a key problem in the field to verify... 

15.11.2023, 13:00  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

Isospectral magnetic graphs via partitions of numbers

Prof. Olaf Post (Trier)

Abstract: In this talk I will present a construction of discrete magnetic non-isomorphic graphs with isospectral Laplacians.  The construction is based on gluing building blocks according to a... 

09.11.2023, 16:00  –  Haus 9, Raum 0.14
Forschungsseminar Differentialgeometrie

An introduction to microlocalisation on a manifold with boundary

Onirban Islam (UP)

Loosely speaking, if two (pseudo)differential operators differ only by smoothing operators then they are called microlocal conjugate to each other. It is a classic result by Duistermaat and Hörmander... 

08.11.2023, 13:00  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

Sampling nodes on graphs using Determinantal Point Processes

Simon Barthelmé

Abstract: Joint work with Nicolas Tremblay, Pierre-Olivier Amblard

Determinantal Point Processes (DPPs) are an important class of models of random sets that arise in many areas of mathematics and... 

07.11.2023, 16:15 - 17:15  –  room 0.13, building 9
SFB-Seminar

Kernel matrices in the flat limit

Simon Barthelmé, CNRS, Gipsa-lab

Kernel matrices are ubiquitous in statistics, numerical analysis, and machine learning, appearing in methods for interpolation, regression, inverse problems, etc. One perennial difficulty in kernel... 

03.11.2023, 10:00  –  Room 2.22, Building 9
Arbeitsgruppenseminar Analysis

Shuffle of trees : the state of the art, Cumulants of bimonoids of species and characteristic operations

Pierre Clavier (Mulhouse), Yannic Vargas (Graz)

Pierre Clavier (Mulhouse):

This talk will be introductory and non-technical, with the aim to introduce the participants to
current research questions about shuffle of rooted forests. I will start by... 

02.11.2023, 10:15  –  Campus Golm, Haus 14, Room 0.21
Forschungsseminar: Gruppen und Operatoralgebren

Ratio-limits and Toeplitz quotients for random walks on relatively hyperbolic groups

Adam Dor-On (Haifa University)

When studying quotients of C*-algebras generated by creation and annihilation operators on analogues of Fock space, the existence of a unique smallest equivariant quotient becomes an important... 

02.11.2023, 16:00  –  Haus 9, Raum 0.14
Forschungsseminar Differentialgeometrie

The Price is right? Statistical and Microscopic Properties of Cryptocurrency Trading

Christoph Stephan

The talk commences with an exploration of the fundamental mechanisms of modern electronic exchanges and their statistical properties, setting the groundwork for understanding price formation in crypto... 

01.11.2023, 11:00  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

Jacaranda and the substreetutions

Renaud Leplaideur (Université de la Nouvelle-Calédonie)

Abstract: I will present a new object, called substreetution, which is an extension of substitutions in dynamics (Z-action) to colored trees (free-group action). The main part of the talk will be... 

27.10.2023, 10:15 - 11:15  –  2.28.0.108
SFB-Kolloquium

On polynomial-time mixing for high-dimensional MCMC in inverse problems

Sven Wang (HU Berlin)

We consider the problem of generating random samples from high-dimensional posterior distributions. We will discuss both (i) conditions under which diffusion-based MCMC algorithms mix... 

27.10.2023, 11:00  –  Raum 2.22, Haus 9, Golm
Arbeitsgruppenseminar Analysis

Rough paths based on multi-indices and their algebraic renormalization

Pablo Linares (Imperial College, London)

Abstract:

Following the approach of Otto et. al., we derive a notion of rough path based on multi-indices suitable for real-valued rough differential equations, and build its associated algebraic... 

26.10.2023, 16:00  –  Raum 0.14
Forschungsseminar Differentialgeometrie

The holographic index theorem

Christian Bär (UP)

The holographic index theorem relates the index of a Dirac-type operator on a compact manifold with boundary subject to certain local boundary conditions to the index of an induced operator on the... 

25.10.2023, 12:00  –  Campus Golm, Building 9, Room 2.22
Forschungsseminar Wahrscheinlichkeitstheorie

Duality, interacting particle systems, and infinite-dimensional orthogonal polynomials

Sabine Jansen (LMU München)

Studying the time-evolution of a many-particle system is a difficult task. For some interacting particle systems in Z^d, duality and intertwining allow to map the time evolution of one- or two-point... 

25.10.2023, 14:00 - 15:30  –  Campus Golm, Building 9, Room 2.22 and via Zoom
Institutskolloquium

80 Years of Mathematical Modelling of Geosphere, Biosphere, and Anthroposphere

Bernhelm Booß-Bavnbeck (Roskilde)

14:00 Bernhelm Booß-Bavnbeck (Roskilde)

14:45 Tea and Coffee Break

Bernhelm Booß-Bavnbeck (Roskilde): 1943-2023, Tribute and Review - 80 Years of Mathematical Modelling of Geosphere, Biosphere, and... 

23.10.2023, 11:00 - 12:00  –  Raum 1.22, Haus 9, Golm
Forschungsseminar: Gruppen und Operatoralgebren

Totally disconnected locally compact groups, groupoids, and computability

André Nies (University of Auckland)

We introduce t.d.l.c. groups and then study their algorithmic aspects. A useful tool is the meet groupoid, which is the natural groupoid on compact open cosets, enriched by the intersection operation.... 

20.10.2023, 11:00 Uhr  –  Room 2.22 of Building 9 & zoom
Arbeitsgruppenseminar Analysis

The frames of a vector bundle groupoid

Alfonso Garmendia (CRM, Barcelona)

Abstract: This talk will explore the structure of vector bundle grupoids, which are groupoids in the category of vector bundles. The most well-known example is the tangent bundle of a groupoid, which... 

19.10.2023, 16:00  –  Haus 9, Raum 0.14
Forschungsseminar Differentialgeometrie

Extracting Hadamard coefficients from Green’s expansions

Lennart Ronge (UP)

Hadamard coefficients are a Lorentzian equivalent to the Riemannian heat kernel coefficients. They encode information about the geometry of the underlying Lorentzian manifold (e.g. the scalar... 

19.10.2023, 10:15  –  Campus Golm, Haus 10, Raum 0.26
Forschungsseminar: Gruppen und Operatoralgebren

Essential Cartan pairs and their non-Hausdorff groupoid models

Jonathan Taylor (UP)

Renault's theorem for Cartan pairs of C*-algebras states that C*-algebras with particularly nice commutative subalgebras, called Cartan subalgebras, admit twisted groupoid models. One of the... 

18.10.2023, 12:00  –  Haus 9, Raum 2.22
Forschungsseminar Wahrscheinlichkeitstheorie

Pseudo-chaotic expansion and explicit correlation formula for the Hawkes processes

Anthony Réveillac (INSA Toulouse)

Hawkes processes have proved to be a powerful probabilistic model for various applications in neurosciences or insurance. These counting processes are defined through their intensity which is... 

18.10.2023, 13:15  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

Computing the spectrum of infinite-volume operators from finite patches

Paul Hege (Tübingen)

Abstract: The spectrum of infinite-volume operators is often computed numerically by considering finite sections with Dirichlet or periodic boundary conditions, but such artificial boundary conditions... 

12.10.2023, 16:15  –  Raum 0.14
Forschungsseminar Differentialgeometrie

Minimal geodescis

Bernd Ammann (Regensburg)

A geodesic is called minimal if a lift to the universal covering globally minimizes distance. On the 2-dimensional torus with an arbitrary Riemannian metric there are... 

20.09.2023, 10:15  –  Raum 2.22
Schülerförderung

Kann man die Form einer Trommel hören?

Christian Bär (UP)

mehr erfahren

11.09. bis 13.09.2023  –  Campus Griebnitzsee
SFB 1294 - Annual Meeting

Potsdam DA Days 2023

The Potsdam DA Days 2023 will take place from September 11^th to 13^th at the Campus Griebnitzsee at the University of Potsdam. The event will be combined with the SFB Annual Meeting and will we opened... 

11.09.2023, 09:30 - 10:30  –  Campus Griebnitzsee, building 6, lecture hall H02
Kálmán Lecture

6th Kálmán Lecture with Richard Nickl

Richard Nickl

This 6th Kálmán Lecture with Richard Nickl is opener for the 2nd Potsdam DA Days. Title of his talk is

'On posterior consistency in non-linear Bayesian data assimilation problems'.

Abstract

Bayesian... 

31.07. bis 04.08.2023  –  Neues Palais, Haus 9, Room 1.09.1.02
Konferenz

Spectral theory and geometry of ergodic Schrödinger operators

Speakers: David Damanik (Rice university, Houston), Anton Gorodetski (University of California, Irvine), Jake Fillman (Texas State University)

Organizers:  Ram Band, Siegfried Beckus, Matthias Keller

... 

26.07.2023  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

Some Results on Absolutely Continuous Spectrum for Laplacians on Radial Metric Tree Graphs

Dr. Christian Seifert (TUHH)

Abstract: Given a radial metric tree graph, we consider Laplacians with self-adjoint coupling conditions at the vertices. We consider the questions whether presence of absolutely continuous spectrum... 

24.07.2023, 10:15  –  2.09.1.10
Forschungsseminar Statistik

Early stopping for conjugate gradients in statistical inverse problems

Laura Hucker (HU)

Abstract:    We consider estimators obtained by applying the conjugate gradient algorithm to the normal equation of a prototypical statistical inverse problem. For such iterative procedures, it is... 

21.07.2023, 9:00 - 10:30  –  Raum 2.22, Haus 9
Forschungsseminar: Gruppen und Operatoralgebren

The Rosenberg Conjecture through the lens of Solidification

Georg Lehner (FU Berlin)

The Rosenberg Conjecture through the lens of Solidification

The Rosenberg Conjecture states that for a given Banach Algebra A, the
comparison map between algebraic and topological K-theory becomes an
... 

21.07.2023, 10:30 Uhr  –  Room 2.22 of Building 9 & zoom
Arbeitsgruppenseminar Analysis

A symplectic morning with Bernhelm Boos-Bavnbeck and Chaofeng Zhu

Bernhelm Booss-Bavnbeck (Roskilde,Danemark), Chaofeng Zhu (Nankai,China)

10:30 Uhr Bernhelm Booss-Bavnbeck (Roskilde,Danemark)

Title: The Calderón Projection for Elliptic Differential Operators on Manifolds with Boundary:
Concept, Meaning, and Deformation Properties

... 

20.07. bis 21.07.2023  –  Campus Griebnitzsee
SFB-Seminar

Rising Stars in Data Assimilation

tba

tba

19.07.2023, 14:00  –  Campus Golm, Building 9, Room 2.22 and via Zoom
Institutskolloquium

Duality in random phenomena.

Adrian Gonzalez Casanova (UNAM, Mexico and UC Berkeley, USA), Maite Wilke Berenguer (HU Berlin)

14:00 Adrian Gonzalez Casanova (UNAM, Mexico and UC Berkeley, USA)

14:45 Tea and Coffee Break

15:15 Maite Wilke Berenguer (HU Berlin)

Adrian Gonzalez Casanova (UNAM, Mexico and UC Berkeley, USA):... 

17.07.2023, 10:15  –  2.09.1.10
Forschungsseminar Statistik

Introduction to Reinforcement Learning

Tomáš Kocák

Abstract:    
Reinforcement Learning (RL), like Multi-Armed Bandits, is a popular paradigm for sequential decision-making under uncertainty. A typical RL algorithm operates with only limited knowledge... 

14.07.2023, 10:15 - 11:15  –  Campus Golm, building 28, lecture hall 0.108
SFB-Kolloquium

Model Order Reduction in Data Assimilation

Karen Veroy-Grepl

The use of model order reduction techniques in combination with data assimilation methods for estimating the state of systems has been of great interest in recent years. In this talk, we discuss some... 

12.07.2023, 10:15 - 11:15  –  2.09.0.14
Forschungsseminar Numerik/Angewandte Mathematik/Statistik

Reduced Basis Methods: From Key Ingredients to 4DVar

Martin Grepl (RWTH Aachen)

The reduced basis method is a certified model order reduction technique for the rapid and reliable solution of parametrized partial differential equations (PDEs), and it is especially suited for the... 

12.07.2023, 14:45 - 17:00  –  Campus Golm, Building 9, Room 2.22 and via Zoom
Institutskolloquium

Arithmetic groups in action

Holger Kammeyer (Heinrich Heine University), Roman Sauer (Karlsruher Institut für Technologie)

14:45 Holger Kammeyer (Heinrich Heine University)

15:30 Tea and Coffee Break

16:00 Roman Sauer (Karlsruher Institut für Technologie)

Holger Kammeyer (Heinrich Heine University): Can one recover... 

12.07.2023, 13:00  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

The hidden structure in Apery's proof

Ofir David (Technion)

Abstract: In 1978, Apery proved the irrationality of the Riemann zeta value ζ(3) by utilizing a fast converging sequence of rational approximations. However, the details of his proof remained... 

12.07.2023, 10:00  –  Campus Golm, Haus 9 Raum 0.17 (und online)
Forschungsseminar Wahrscheinlichkeitstheorie

On the space-time correlations in KPZ growth models

Patrik Ferrari (Univ. Bonn)

We will discuss results on the correlation structure of some models in the KPZ universality class, for instance, on the covariance of limiting the processes along characteristic lines and of the... 

06.07. bis 06.07.2023, 13:00 - 14:00  –  2.22
Forschungsseminar: Gruppen und Operatoralgebren

Simplicity of crossed products by FC-hypercentral groups

Dan Ursu (University of Münster)

Results from a few years ago of Kennedy and Schafhauser characterize simplicity of reduced crossed products AxG, where A is a unital C*-algebra and G is a discrete group, under an assumption which... 

05.07.2023, 10:00  –  Campus Golm, Haus 9 Raum 0.17 (und online)
Forschungsseminar Wahrscheinlichkeitstheorie

Improved error bounds for score-based diffusion models

Giovanni Conforti (Ecole Polytechnique, Palaiseau)

The aim of this talk is to provide with an introduction to score-based diffusion models, that are a special class of generative models that has recently provided with impressive experimental results... 

05.07.2023, 13:00  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

Existence of minimizers for weighted Lp-Hardy inequalities

Ujjal Das (Technion)

The abstract can be found here.

03.07.2023, 10:15  –  Golm, Haus 9, Raum 1.10
Forschungsseminar Statistik

Expert-ranking for bi-isotonic matrices under unknown permutations

Max Graf

Abstract:  

 As motivation, we consider a bunch of experts responding to a set of questions, where we can observe whether an expert answers a question correctly or not. Assume that for every pair of... 

30.06.2023, 11 Uhr  –  Haus 9, Raum 2.23
Arbeitsgruppenseminar Analysis

A groupoidal approach to polyhomogeneous pseudodifferential operators in the Heisenberg setting.

Nathan Couchet (University of Clermont-Auvergne, France)

Abstract:

The aim of this talk is to present a groupoidal approach to pseudodifferential calculi and how it can be implemented to define pseudodifferential  operators on smooth manifolds,... 

29.06.2023, 16:00  –  Raum 0.14
Forschungsseminar Differentialgeometrie

On the tameness of the Fréchet space of smooth functions on a compact manifold

Christian Bär (UP)

We give a simple proof of the tameness of the Fréchet space of smooth sections of a vector bundle over a compact manifold.

28.06.2023, 13:00  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

The Maslov index in spectral theory: an overview

Selim Sukhtaiev (Auburn University)

Abstract: This talk is centered around a symplectic approach to eigenvalue problems for systems of ordinary differential operators (e.g., Sturm-Liouville operators, canonical systems, and quantum... 

28.06.2023, 10:00  –  House 9, Campus Golm, Room 0.17
Forschungsseminar Wahrscheinlichkeitstheorie

About some reinforcement stochastic processes

Pierre-Yves Louis (Univ. Bourgogne Franche-Comté)

We will present an overview of some new models and results about the long time behaviour of stochastic processes with reinforcement. Some applications will be outlined : urn models with different kind... 

23.06.2023, 10:15 - 11:15  –  Campus Golm, building 28, lecture hall 0.108
SFB-Kolloquium

Research data in mathematics, FAIRness, and the MaRDI consortium

Tabea Krause & Tabea Bacher, MaRDI

In this talk we will introduce a definition of 'research data' in mathematics which encompasses all digital objects you handle in the process of doing research. We will discuss how these data can be... 

22.06.2023, 14:15-15:45  –  Zoom
Geometric Analysis, Differential Geometry and Relativity

A Rigidity Theorem for Asymptotically Flat Static Manifolds and its Applications

Brian Harvie (National Taiwan University)

In general relativity, many physically and mathematically important questions concern the uniqueness of the Schwarzschild space. For example, the black hole uniqueness theorem states that the... 

22.06.2023, 14:00 - 17:00  –  Campus Golm, Building 9, Room 2.22
Institutsveranstaltung

Talks by Master's Students fom Potsdam and Rennes

We cordially invite you to our joint event between visitors from Rennes who participate in the EDUC program and our Master's students. There will be  short talks by students from Potsdam and Rennes on... 

22.06.2023, 13:00 - 14:00  –  Haus 9, Raum 2.22
Forschungsseminar: Gruppen und Operatoralgebren

Linear independence of coherent systems associated to discrete subgroups

Ulrik Enstad (UP)

The HRT conjecture states that any finite set of time-frequency shifts of a nonzero, square-integrable function is linearly independent. While the conjecture is still open, it was settled by Linnell... 

21.06.2023, 13:00  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

A diophantine characterization of linear repetitivity in cut and project sets: quantitative results.

Johannes Happich (Leipzig)

Abstract: When comparing the complexity of different aperiodic quasicrystals, it appears that linear repetitivity is a useful property that only applies to the - in some sense - most regular... 

19.06.2023, 10:15  –  Zoom
Forschungsseminar Statistik

Active clustering with bandit feedback

Victor Thuot

Abstract:  
We investigate the problem of active clustering with bandit feedback, a pure exploration bandit problem.
Unlike the well-known and extensively studied problem of clustering, active... 

16.06.2023, 13:15  –  Haus 9, Raum 2.22 und Zoom
Forschungsseminar Diskrete Spektraltheorie

Duistermaat index and eigenvalue interlacing for self-adjoint extensions of a symmetric operator

Gregory Berkolaiko

Abstract:
Eigenvalue interlacing is a tremendously useful tool in linear algebra
and spectral analysis.  In its simplest form, the interlacing
inequality states that a rank-one positive perturbation... 

16.06.2023, 14:00  –  Raum 1.22
Verteidigung Masterarbeit / Master's Thesis Defence

Diskrete Untergruppen der Isometriegruppe der hyperbolischen Geometrie und ihre Visualisierung im Hyperboloidmodell auf dem Computer

Alexander Grabow

mehr erfahren

15.06.2023, 16:00  –  Raum 0.14
Forschungsseminar Differentialgeometrie

Introduction to Fréchet Manifolds V

Rubens Longhi

Connections on Fréchet vector bundles and Fréchet Lie groups. [I.4.5-I.4.6]

15.06. bis 15.06.2023, 13:00 - 14:00  –  2.22
Forschungsseminar: Gruppen und Operatoralgebren

Entropy, orbit equivalence, and the Rokhlin lemma

David Kerr (University of Münster)

I will discuss some recents applications and developments surrounding the Ornstein-Weiss Rokhlin lemma involving quantitative versions of orbit equivalence and questions of tileability in topological... 

14.06.2023, 13:00  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

Spectral minimal partitions of metric graphs: what and why?

James Kennedy

Abstract: SMPs offer a way of dividing a given object (domain, manifold or graph) into a given number of pieces in an ``analytically optimal'' way: typically, one attempts to minimise an energy... 

14.06.2023, 14:00  –  Golm campus, Building 9, Room 2.22
Institutskolloquium

On the design of scientific visualization

Nicolas Rougier (INRIA, Bordeaux)

14:00 Nicolas Rougier (INRIA, Bordeaux): On the design of scientific visualization

15:00 Tea and Coffee Break

Abstracts:

Nicolas Rougier (INRIA, Bordeaux): On the design of scientific visualization
Ab... 

08.06.2023, 16:00  –  Raum 0.14
Forschungsseminar Differentialgeometrie

What is a jet bundle?

Christian Bär (UP)

I'll give a concise introduction to jet bundles of vector bundles. They allow to treat (higher) derivatives of sections in a coordinate invariant way without the need to introduce connections.... 

08.06. bis 08.06.2023, 13:00 - 14:00  –  2.22
Forschungsseminar: Gruppen und Operatoralgebren

The dichotomy amenable/paradoxical in inverse semigroups and their uniform Roe algebras

Fernando Lledo (University Carlos III de Madrid)

In the present talk I will briefly review certain aspects of the dichotomy amenable/paradoxical in the category of metric spaces and inverse semigroups. Then I will address the question of defining a... 

07.06.2023, 10:00  –  Campus Golm, Haus 9, Raum 0.17 (und online)
Forschungsseminar Wahrscheinlichkeitstheorie

Sandpile models and spanning trees

Wioletta Ruszel (Univ. Utrecht)

The sandpile model (aka chip-firing game) is a toy model for studying self-organized criticality (SOC). SOC models are characterized by displaying power-law probability behaviour of certain quantities... 

07.06.2023, 13:00  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

Gaussian upper heat kernel bounds and Sobolev inequalities on graphs with unbounded geometry

Dr. Christian Rose (Potsdam)

Abstract: On Riemannian manifolds the conjunction of Gaussian upper heat kernel bounds and the volume doubling property of balls are equivalent to Sobolev inequalities in arbitrarily small balls. The... 

06.06.2023, 15 Uhr  –  Zoom
Arbeitsgruppenseminar Analysis

Phenomena in High Dimensions

Pierre Youssef (New York University, Abu Dhabi)

Abstract:

What do high dimensional convex bodies look like? How does the spectrum of a random matrix behave as its dimension grows? How does the connectivity of a graph evolve as its size grows? In... 

05.06.2023, 10:15  –  Campus Golm, Haus 9, Raum 1.10
Forschungsseminar Statistik

Parameter Estimation from Noisy Observations of a Stochastic Heat Equation

Gregor Pasemann (HU)

We consider the problem of estimating the diffusivity of a stochastic heat equation (or more generally, the parametrized drift of an abstract linear stochastic parabolic evolution equation) from... 

02.06.2023, 11 Uhr  –  Haus 9, Raum 2.22
Arbeitsgruppenseminar Analysis

Varieties of Discrete Signatures

Carlo Bellingeri (TU)

Abstract:

Following the work of Diehl, Ebrahimi-Fard and Tapia on discrete signatures of a time series, we will discuss the geometric properties of the discrete signature variety, i.e. the points... 

01.06.2023, 15:30-16:30  –  Zoom
JoMaReC

A Green’s function proof of the positive mass theorem and related topics

Virginia Agostiniani

In this talk, we will explore the role of harmonic and p-harmonic functions in establishing fundamental geometric inequalities in mathematical relativity, such as the positive mass theorem and the... 

31.05.2023, 13:00  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

Parabolic nonlocal equations with bounded measurable coefficients.

Marvin Weidner (Barcelona)

Abstract: The celebrated De Giorgi-Nash-Moser theory establishes Hölder regularity of solutions to second order equations in divergence form without any regularity assumptions on the coefficients.... 

31.05.2023, 10:00  –  Campus Golm, Haus 9, Raum 0.17 (and Online)
Forschungsseminar Wahrscheinlichkeitstheorie

Number-Rigidity and β-Circular Riesz gas

David Dereudre (Univ. Lille)

For an inverse temperature β>0, we define the β-circular Riesz gas on Rd as any microscopic thermodynamic limit of Gibbs particle systems on the torus interacting via the Riesz potential... 

26.05.2023, 10:15 - 11:15  –  Campus Golm, building 28, lecture hall 0.108
SFB-Kolloquium

Conservative SPDEs as fluctuating mean field limits of stochastic gradient descent

Vitalii Konarovskyi, University of Bielefeld

My talk will be devoted to the convergence of stochastic interacting particle systems in the mean-field limit to solutions of conservative SPDEs. We will discuss the optimal convergence rate and... 

26.05.2023, 16:00  –  Online Talk
Arbeitsgruppenseminar Analysis

Linear Causal Disentanglement

Anna Seigal (Harvard University)

Abstract:

Causal disentanglement is the problem of finding a representation of data involving variables that relate causally to one another. In this talk, the focus will be on linear causal... 

25.05.2023, 16:00  –  Raum 0.14
Forschungsseminar Differentialgeometrie

Introduction to Fréchet Manifolds IV

Florian Hanisch

Fréchet manifolds and vector bundles. [I.4.1-I.4.4]

24.05.2023, 13:00  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

Spectral properties of quasiperiodic metric graphs

Gilad Sofer (Technion)

Abstract: Sturmian Hamiltonians appear in mathematical physics as popular models for one-dimensional quasicrystals. This family of discrete quasiperiodic Schrödinger operators, including the well... 

17.05.2023, 10:00  –  Campus Golm, Haus 9, Raum 0.17 & online
Forschungsseminar Wahrscheinlichkeitstheorie

Yaglom limits and convergence on local times for Bienaymé-Galton-Watson processes with immigration

Ben Povar (Univ. of Warwick)

We study the joint convergence of Bienaymé-Galton-Watson processes with immigration (BGWI) and its ``naive'' local times at 0 to the corresponding Continuous Branching Process with immigration (CBI)... 

17.05.2023, 13:00  –  Haus 9, Raum 0.17 und Zoom
Berlin-Brandenburgisches Seminar Mathematik und ihre Didaktik

Ergodicity of Skew-Products over Markov Chains

Pablo Lummerzheim (Leipzig)

Title: Ergodicity of Skew-Products over  Markov Chains

Abstract: We extend a criterion of Alexander I. Bufetov for the ergodicity of skew-product extensions of Markov shifts with finite state space to... 

16.05.2023, 15:00  –  Zoom meeting
Arbeitsgruppenseminar Analysis

Symmetries in algebraic geometry and motives

Joseph Ayoub (University of Zurich)

Abstract:

Starting from the general notion of `symmetry' in mathematics, we give a gentle introduction to the theory of motives, which is the universal cohomology theory for algebraic varieties.

This... 

12.05.2023, 14:00 Uhr  –  Haus 9, Raum 2.22 + Zoom
Arbeitsgruppenseminar Analysis

Volumes and triangulations of flow polytopes of graphs

Alejandro Morales (University of Massachussetts Amherst)

Abstract:

A flow polytope of a directed acyclic graph is the set of flows on the edges of the graph with prescribed netflows on vertices. The conservation of flow is analogous to conservation of... 

11.05.2023, 16:00  –  Raum 0.14
Forschungsseminar Differentialgeometrie

Introduction to Fréchet Manifolds III

Christian Bär

Higher derivatives in Fréchet spaces. [I.3.5-I.3.6]

11.05.2023, 14:15-15:45  –  2.22 und Zoom
Geometric Analysis, Differential Geometry and Relativity

An energy minimizing flow for rotating stars in GR

Prof. Dr. Helmut Kaul (Universität Tübingen)

Within the framework of general relativity a star model is treated, consisting of a rotating liquid in the equilibrium of gravitational forces, pressure and centrifugal forces. I show the existence of... 

10.05.2023, 10:00  –  Campus Golm, Haus 9, Raum 0.17 & online
Forschungsseminar Wahrscheinlichkeitstheorie

Stochastic model of tumor evolution for cancer etiology and risk

Dr. Sophie Pénisson (Univ. Paris-Est Créteil)

We present a mathematical model of tumor evolution that includes all phases in the life of a tissue, from tissue development to cancer occurrence. The effects of a carrying capacity, different types... 

10.05.2023, 13:00  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

Sharp Hardy-type inequalities for non-compact harmonic manifolds and Damek-Ricci spaces.

Florian Fischer (Potsdam)

Abstract: We show various sharp Hardy-type inequalities for the linear and quasi-linear Laplacian on non-compact harmonic manifolds with a particular focus on the case of Damek-Ricci spaces. Our... 

05.05.2023, 14:30  –  Auditorium Maximum im Haus 8, Am Neuen Palais
Ankündigung

Euler-Vorlesung 2023

Avi Wigderson und Catherine Goldstein

Die Euler-Vorlesung in 2023 wird vom Mathematiker Avi Wigderson aus Princeton gehalten. Den traditionellen historischen Vortrag wird die Mathematikerin Catherine Goldstein aus Paris geben.

Euler-Vorle... 

05.05.2023, 13:00 (Note the unusual time!)
Arbeitsgruppenseminar Analysis

Strichartz estimates for the Schrödinger equation on compact Lie groups

Duván Cardona (University of Gent, Belgium)

Some of us will follow the talk in the seminar room 2.22 of the maths building Golm Campus. Here is the link for the access  per Zoom:

   Login data for the Zoom Meeting
   https://us02web.zoom.us/j/... 

04.05.2023, 16:00  –  Raum 0.14
Forschungsseminar Differentialgeometrie

Introduction to Fréchet Manifolds II

Christoph Stephan

Differentiation in Fréchet spaces [I.3.1-I.3.4]

03.05.2023, 10:00  –  Campus Golm, Haus 9, Raum 0.17
Forschungsseminar Wahrscheinlichkeitstheorie

High-dimensional grid exploration using self-avoiding exclusion processes

Dr. Jens Fischer (D-fine AG, Zürich; Univ. Toulouse)

With the advancements in quantum computing in recent years, the need for secure encoding methods, which can withstand quantum attacks, has motivated a new research branch in cryptography known as... 

28.04.2023, 11:00  –  Golm campus, Building 9, Room 2.22 + Zoom
Arbeitsgruppenseminar Analysis

A categorical approach to Statistical Mechanics

Grégoire Sergeant (INRIA and Sorbonne Université, Paris)

Statistical physics is a framework that focuses on the probabilistic description of complex systems: a collection of interacting 'particles' or components of a whole in most generality. In (rigorous)... 

28.04.2023, 13:30  –  Golm, Haus 9, Raum 2.22
Verteidigung Dissertation / PhD Defence

The Milnor-Moore and Poincaré-Birkhoff-Witt theorems in the locality set up, and the polar structure of Shintani zeta functions

Diego Andrés López Valencia

Ameldungen für ZOOM unter paycha@math.uni-potsdam.de

27.04.2023, 16:00  –  Raum 0.14
Forschungsseminar Differentialgeometrie

Introduction to Fréchet Manifolds I

Christian Bär

In a series of lectures we introduce some basics for the block seminar on the Nash-Moser inverse function theorem. We start with the definition of and examples for Fréchet spaces and discuss Fréchet-s... 

26.04.2023, 10:00  –  Campus Golm, Haus 9, Raum 0.17 & Online
Forschungsseminar Wahrscheinlichkeitstheorie

Construction of a biological model and study of experimental design

Laetitia Colombani (Univ. Bern)

In this seminar, I will introduce a biological model we are constructing, and explain the questions that drives us. In link with this model, I will present the notion of experimental design, and how... 

26.04.2023, 4 pm  –  2.09.1.22
SIAM Chapter Seminar

An Introduction to Statistical Estimation Theory

Maximilian Graf

Abstract: The aim of this talk is the introduction of basic concepts of estimation theory illustrated by some simple examples. We focus on the notion of risk bounds and minimax risk. In this context,... 

21.04.2023, 10:15 - 11:15  –  Campus Golm, building 28, lecture hall 0.108
SFB-Kolloquium

Seasonal forecasting - opportunities and challenges

Antje Weisheimer, European Centre for Medium-Range Weather Forecasts

Seasonal forecasts aim to provide physically-based probabilistic outlooks of the climate conditions for the coming seasons. We create them by initialising coupled atmosphere-ocean-sea-ice models with... 

21.04.2023, 13:00  –  Room 2.09.2.22
Verteidigung Masterarbeit / Master's Thesis Defence

Non-Euclidean Estimates for Sturmian Hamiltonians

Yannik Thomas

Abstract: In this talk we study the spectral map of the Hamiltonians associated to quasi Sturmian dynamical systems. We describe a non-Euclidean metric on the parameter space which makes the spectral... 

20.04.2023, 16:00  –  Raum 0.14
Forschungsseminar Differentialgeometrie

The APS-Theorem for general geometric operators

Alberto Richtsfeld (UP)

The APS theorem is the extension of the Atiyah-Singer index theorem to manifolds with boundary. While the Atiyah-Singer index theorem holds for all elliptic differential operators, the APS theorem in... 

20.04.2023, 13:00 (unusal time and day!)  –  Online seminar
Arbeitsgruppenseminar Analysis

(Twisted) spectral triples and physics

Pierre Martinetti (University of Genoa)

We shall give an overview of the applications of spectral triples to high energy physics, in particular the Standard Model of fundamental interactions. Time permitting, we will present some recent... 

19.04.2023, 14:00  –  Golm campus, Building 9, Room 2.22 and online
Institutskolloquium

Mathematical aspects of tipping points in climate studies

Anna von der Heydt (Utrecht University) and Robbin Bastiaansen (Utrecht University)

14:00 Anna von der Heydt (Utrecht University): Dynamical systems approaches to climate response and climate tipping (via zoom)

14:45 Tea and Coffee Break

15:15 Robbin Bastiaansen (Utrecht University):... 

04.04.2023, 15:00  –  Online Seminar
Arbeitsgruppenseminar Analysis

Numerical semi-groups and applications

Abdallah ASSI (University of Angers)

A numerical semigroup  (NSG for short) is a monoid S of the set N of non negative integers such that the group generated by S in Z is Z (that is, S is stable under addition, 0 is an element of S, and... 

27.03. bis 29.03.2023, 8h30 - 18h30  –  Campus Griebnitzsee, Haus 6
Konferenz

Tagung „MATh.en.JEANS“

Eine Konferenz der besonderen Art: Schülerinnen und Schüler französischer Gymnasien aus ganz Europa präsentieren ihre jährlichen mathematischen Forschungsergebnisse, die in Arbeitsgruppen zusammen mit... 

20.03.2023, 14:00 Uhr  –  Campus Golm, Haus 9, Raum 2.22 + Zoom
Forschungsseminar Diskrete Spektraltheorie

MSc Verteidigung - Graphs with Nilpotent Group Actions and their Drifts

Matti Richter (Potsdam)

Abstract: We study positive generalized eigenfunctions of Schrödinger operators associated to graphs with cocompact group actions of nilpotent groups. For such a graph, we investigate the topological... 

07.03.2023, 16:00  –  Online Seminar
Arbeitsgruppenseminar Analysis

Interactions between ergodic theory and number theory: from beta-expansions to the Sierpinski gasket

Karma Dajani (Utrecht University)

In this talk we give an exposition on one of the interactions between ergodic theory and number theory. We will concentrate on the concept of β-expansions, which are representations of numbers of the... 

22.02.2023, 4 pm  –  2.09.2.22
SIAM Chapter Seminar

Framework Materials and Cylinder Packings

Matthias Himmelmann

Abstract: In a geometric context, framework materials are structures composed of many rigid bars (or edges), pinned together at vertices where the bars can freely rotate relative to each other. These... 

20.02. bis 24.02.2023  –  Campus Golm, Haus 10, Raum 0.25
Konferenz

Microlocal and Global Analysis, Interactions with Geometry 2023

diverse

We have the pleasure to invite you to the next edition of a series of meetings initiated by Professor Schulze devoted to microlocal, singular and global analysis and their interactions with geometry... 

17.02.2023, 11:00  –  Golm, Haus 9, 2.22 + Zoom
Arbeitsgruppenseminar Analysis

Magnetic Laplacian on differential forms

Georges Habib (University of Lebanon, Beirut)

In this work, we introduce the magnetic Hodge Laplacian, which is a generalization of the magnetic Laplacian on functions to differential forms. We consider various spectral results, which are known... 

15.02.2023, 11:00  –  Golm, Haus 9, 2.22 + Zoom
Arbeitsgruppenseminar Analysis

The power series expansion of CR functions

Giuseppe Della Sala (American University of Beirut)

The field of Several Complex Variables studies the properties complex manifolds of dimension at least 2, and the corresponding holomorphic maps. In the subfield of CR Geometry, the main objects of... 

10.02.2023, 10:15 - 11:15  –  Campus Golm, Building 28, Room 0.108
SFB-Kolloquium

Understanding and Applying Reinforcement Learning

Claire Vernade, DeepMind, London (UK)

Reinforcement Learning (RL) builds learning systems from the ground up by trial and error: as the agent takes actions, they receive rewards and observations that allow them to build a more... 

09.02.2023, 14:00-14:30  –  Haus 9, Raum 0.17
Verteidigung Masterarbeit / Master's Thesis Defence

Geometric Methods in Disordered Soft Packings

Herr Lukas Minogue

Betreuerin:  Prof. Myfanwy Evans

09.02.2023, 14:15-15:45  –  2.22 und Zoom
Geometric Analysis, Differential Geometry and Relativity

On the approximation of null hypersurfaces via maximal surfaces

Albachiara Cogo

Maximal surfaces are spacelike hypersurfaces of a Lorentzian manifold which are critical points of the area functional. They are very important tools in General Relativity and can be studied by... 

08.02.2023, 13:30 Uhr  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

Regularity results for locally integrable subharmonic functions on local Dirichlet spaces

Prof. Dr. Peter Stollmann (Chemnitz)

Abstract: We report on recent results from a joint work with B. Güneysu, S. Pigola and. G. Veronelli. Using a new notion of subharmonicity we can prove a version of the Braverman-Milatovic-Shubin... 

08.02.2023, 12:00 – 14:00 Uhr  –  Campus Golm, Haus 12, Raum 0.01
Öffentlicher Vortrag

Lunch Talks zum UN Tag "Women in Science" - Begegnungen mit Wissenschaftlerinnen aus der ganzen Welt

(English? click here) (Flyer der Veranstaltung)

Anlässlich des internationalen Tages Women in Science – der die Leistungen und spezifischen Herausforderungen von Wissenschaftlerinnen sichtbarer machen... 

08.02.2023, 12 – 2 pm  –  Campus Golm, Building 12, Room 0.01
Öffentlicher Vortrag

International Day "Women in Science" Lunch Talks – Encounters With Female Scientists From Around The Word

(Deutsch? Hier klicken) (Event Flyer)

On the occasion of the international day Women in Science – aiming to make the achievements and specific challenges of female scientists more visible – we invite... 

07.02.2023, 15:00 - 17:00 CET  –  Online
Arbeitsgruppenseminar Analysis

Colloquium "Mathematics in Lebanon and beyond"

George Saliba (AUB) and Hussein Mourtada (IMJ, Université Paris-Cité)

Opening session of the colloquium  "Mathematics in Lebanon and beyond". The colloquium will serve as a meeting place for scientific exchange, bringing together mathematicians and physicists from the... 

06.02.2023, 10:15  –  Golm Haus 9, 2.22 and Zoom
Forschungsseminar Statistik

A Short Introduction to Estimation of Permuted Bi-Isotonic Matrices

Max Graf

Abstract:
As motivation, we consider a bunch of experts responding to a set of questions, where we can observe whether an expert answers a question correctly or not. Assume that for every pair of... 

06.02.2023, 13:00  –  Campus Golm, Haus 9, Raum 2.22
Forschungsseminar Wahrscheinlichkeitstheorie

Local time approximation in parameter estimation for skew-sticky diffusions

Sara Mazzonetto (Univ. de Lorraine, Nancy)

In this seminar we first describe a class of real Markov processes with continuous sample paths which
shows singular behavior at a point, let us say barrier. The barrier is semi-permeable or sticky.... 

03.02.2023, 13:30 (unusal time!)  –  Zoom Meeting
Arbeitsgruppenseminar Analysis

The mathematics of causal set theory

Sumati Surya (Raman Research Institute, Bangalore, India)

Causal set theory is a discrete  approach to quantum gravity, where the Lorentzian spacetime continuum is replaced by locally finite partially ordered sets. The latter, which we call a "causal set" is... 

02.02.2023, 16:00  –  Raum 1.10
Forschungsseminar Differentialgeometrie

Fundamental solutions of partial derivatives on a half-space

Onirban Islam

The Dirac operator on a globally hyperbolic spacetime admits unique retarded and advanced fundamental solutions. They are well-known to be Lagrangian distributions. Recently, Bär and Gehring... 

01.02.2023, 14:15 Uhr  –  Raum 2.09.2.22 und Zoom, Public Viewing im Raum 2.09.0.17
Institutsveranstaltung

Maria-Weber lecture

Dr. Siegfried Beckus (UP)

Title: Dry Ten Martini Problem for Sturmian Dynamical Systems

Abstract: Are all possible spectral gaps, predicted by the Gap labelling theorem, open for a given Schrödinger operator? This is the so... 

30.01.2023, 14:00  –  Campus Golm, Haus 9, Raum 2.22
Forschungsseminar Wahrscheinlichkeitstheorie

Homogenisation of a multivariate diffusion with semipermeable reflecting interfaces

Olga Aryasova (Inst. of Geophysics, Nat. Acad. of Sciences of Ukraine / Friedrich–Schiller–Univ. Jena)

We study the homogenization problem for a multivariate stochastic differential equations with local times that determine semipermeable reflecting hyperplane interfaces. We show that this system has a... 

27.01.2023, 11:00  –  Zoom Meeting
Arbeitsgruppenseminar Analysis

Integrability, Painlevé Singularities and Fixed Points at Infinity

Jeremy Schiff (Bar-Ilan University, Israel)

I will review the notion of integrability for different kinds of (systems of) ordinary differential equations, and the relationship with the Painlevé property, that the only movable singularities of... 

25.01.2023, 4:30 pm  –  House 9, Room 2.22
SIAM Chapter Seminar

Frequentist Ensemble Kalman Filtering

Maia Tienstra

Abstract:

In this talk I will briefly discuss statistical inverse problems, and how we can solve them using the Ensemble Kalman filter. I will then explain how in this setting, we implement early... 

25.01.2023, 14 Uhr  –  Golm, Haus 9, Zimmer 2.22 + Zoom
Institutskolloquium

Differential equations and matrix equations in data science

Martin Stoll (Uni Chemnitz) und Melina Freitag (Uni Potsdam)

Zoom 14:00 Martin Stoll (Uni Chemnitz): From PDEs to data science: an adventure with the graph Laplacian

14:45 Tee und Kaffee Pause

15:15 Melina Freitag (Uni Potsdam): Large scale Lyapunov... 

23.01.2023, 14:15-15:45  –  Zoom und 2.22
Geometric Analysis, Differential Geometry and Relativity

Ricci-Flow on surfaces along the standard light cone in the 3+1 Minkowski spacetime and applications

Markus Wolff

By identifying the conformal structure of the round $2$-sphere with the standard lightcone in the $3+1$ Minkowski spacetime we gain a new perspective on $2d$ Ricci flow on topological spheres in the... 

23.01.2023, 13:00  –  Campus Golm, Haus 9, Raum 2.22
Forschungsseminar Wahrscheinlichkeitstheorie

Early stages of the malaria parasite inside the mosquito

Dr. Angelo Valleriani (Max-Planck-Inst. of Colloids and Interfaces, Dept of Biomaterials, Potsdam)

The malaria parasite Plasmodium falciparum is ingested by the mosquito of the species Anophele, when
the mosquito gets a blood meal from an infected host. Inside the mosquito, the parasite's first 24... 

20.01.2023, 12:00 (unusal time)  –  Zoom meeting
Arbeitsgruppenseminar Analysis

On Spectral Truncations of the d-Torus

Malte Leimbach (Radboud University, Nijmegen)

A couple of years ago, Connes and van Suijlekom introduced the notion of spectral truncation of a spectral triple as a means to trea noncommutative geometry at finite resolution. 
... 

19.01.2023, 16:00 - 19:30  –  Audimax, Campus Neues Palais
Mathematik-Olympiade

Siegerehrung

Die Siegerehrung der Stadtolympiade Potsdam als zweite Stufe der Landesmathematikolympiade findet dieses Jahr wieder unter der Schirmherrschaft des Instituts für Mathematik der Universität Potsdam... 

19.01.2023, 14:15-15:45  –  2.22 und Zoom
Geometric Analysis, Differential Geometry and Relativity

Hawking mass monotonicity for initial data sets

Sven Hirsch

An interesting feature of General Relativity is the presence of singularities which can happen in even the simplest examples such as the Schwarzschild spacetime. However, in this case the singularity... 

18.01.2023, 15:00  –  Raum 2.22 und Zoom
Verteidigung Dissertation / PhD Defence

Non-local boundary conditions for the spin Dirac operator on spacetimes with timelike boundary

Penelope Gehring

Non-local boundary conditions – for example the Atiyah–Patodi–Singer (APS) conditions – for Dirac operators on Riemannian manifolds are rather well-understood, while not much is known for such... 

18.01.2023, 13:00  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

A dynamical approach to density theorems for sampling in unimodular groups

Dr. Ulrik Enstad (Stockholm University)

Abstract: Many structured function systems in harmonic analysis arise from the action of a unitary group representation on a single vector in the underlying Hilbert space. A central question is... 

17.01.2023, 11H00  –  Campus Golm, Haus 9, Raum 2.22
Forschungsseminar Wahrscheinlichkeitstheorie

Nonlinear pseudo-differential operators and stochastic equations on p-adic fields

Oleksandra Antoniouk (Institute of Mathematics NAS of Ukraine,  Kyiv Academic University)

The talk gives a brief overview of the results related to the theory of pseudo-differential equations in the spaces of test and generalized functions on the field of p-adic numbers. Results related to... 

16.01.2023, 13:00  –  Campus Golm, Haus 9, Raum 2.22
Forschungsseminar Wahrscheinlichkeitstheorie

Reflected diffusions in cones

Andrey Pilipenko (Inst. of Mathematics, Nat. Acad. of Sciences & Nat. TU of Ukraine, Kyiv)

Let X be a diffusion in a cone with oblique reflection at the boundary. We study the question whether X reaches a vertex of the cone in a finite time with positive probability. A new probabilistic... 

13.01.2023, 11:00  –  Raum 2.22 + Zoom
Arbeitsgruppenseminar Analysis

Quantization and examples

Alfonso Garmendia (CRM, Barcelona)

Quantization tries to associate a classical system (a Poisson Manifold) to a quantum system (a C*-algebra) in a way that preserves the symmetries. This talk tries to convey the motivation and a... 

13.01.2023, 10:15 - 11:15  –  Campus Golm, Building 28, Room 0.108
SFB-Kolloquium

Deep Learning Statistical Tests for Genetic Studies of Image Phenotypes

Christoph Lippert (HPI)

In my talk I will give an overview on our ongoing work on the development of methods for finding associations between variation that is encoded in images and another variable such as genetics. To do... 

12.01.2023, 16:00  –  Raum 1.10
Forschungsseminar Differentialgeometrie

The Rarita-Schwinger Operator on the Berger Sphere .

Peter Grabs

We look at as a Lie Group and its representations, spin structure and Rarita-Schwinger operator. (In preparation to one day compute the Rarita-Schwinger spectrum using representation... 

12.01.2023, 14:15-15:45  –  2.22 und Zoom
Geometric Analysis, Differential Geometry and Relativity

Static vacuum metrics with prescribed Bartnik boundary data

Zhongshan An

The study of static vacuum Riemannian metrics arises naturally in differential geometry and general relativity. It plays an important role in scalar curvature deformation, as well as constructing... 

11.01.2023, 13:30  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

Polya-Szego inequality on 2-D lattice graph.

Shubham Gupta

Abstract: In the continuum, symmetrization inequalities are a fundamental tool in various parts of analysis: variational problems, spectral geometry, mathematical physics just to name a few. In this... 

09.01.2023, 10:15  –  Golm, Hs. 9, room 2.22 (and Zoom)
Forschungsseminar Statistik

Investigating Continuous Optimization for fast Change Point Detection: Results of a short Research Internship at Macquarie University, Sydney.

Hans Reimann

Abstract:

Change point detection may be considered an essential step in data exploration and diagnostics. Offline approaches reformulating the problem as a subset selection problem in linear... 

04.01.2023, 13:30  –  Haus 9, Raum 0.17 und Zoom
Berlin-Brandenburgisches Seminar Mathematik und ihre Didaktik

Uniqueness for elliptic equations on infinite graphs.

Fabio Punzo

Abstract: The talk is concerned with uniqueness, in weighted l^p spaces, of solutions to the Schrodinger equation, posed on an infinite graph. We shall distinguish the case p>=2 and 1<=p<2. 

Such... 

15.12.2022, 14:15-15:45  –  2.22 und Zoom
Geometric Analysis, Differential Geometry and Relativity

Decay of waves in gravitational solitons

Sharmila Gunasekarans

Gravitational solitons are globally stationary, horizonless asymptotically flat spacetimes with positive energy. I will address the stability of a particular family of solitons at the simplest level... 

15.12.2022, 16:00  –  Raum 1.10
Forschungsseminar Differentialgeometrie

Elastic shells

Claudia Grabs (UP)

Following chapter 10 in the book "Theoretical Elasticity" of A.E. Green and W. Zerna from 1968, we present basic equations for elastic shells. Since the three-dimensional equations for an elastic... 

14.12.2022, 12:15  –  Golm, Haus 9, 1.10
SFB-Seminar

Bayesian and Deterministic Spatio-Temporal Methods with Edge-Preserving Priors for Inverse Problems

Mirjeta Pasha (Tufts University)

Abstract: Inverse problems are ubiquitous in many fields of science such as engineering, biology, medical imaging, atmospheric science, and geophysics. Three emerging challenges on obtaining relevant... 

14.12.2022, 14:00  –  Campus Golm, Haus 9, Raum 2.22
Arbeitsgruppenseminar Angwandte Geometrie und Topologie

Geometry and Topology in Biological Materials

Gerd Schröder-Turk, Murdoch University and Łucja Kowalewska University of Warsaw

14:00 Gerd Schröder-Turk: Nature's amazing mazes: bicontinuous surfaces in butterflies and their physical properties
15:00 Łucja Kowalewska: Structural dynamics of plant plastid membranes

14.12.2022, 13:30  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

The space of Hardy-weights for quasilinear equations: Maz’ya-type characterization and sufficient conditions for existence of minimizers

Prof. Yehuda Pinchover (Technion)

Abstract: Let p ∈ (1,∞) and  Ω⊂ℝ^N be a domain. 

Let A:=(a_ij) ∈ L^∞_loc(Ω ; ℝ^{N× N}) be  a symmetric and locally uniformly positive definite matrix. Set |ξ|_A²:= ∑_i,j=1^N a_ij(x) ξ_i ξ_j,  ξ ∈ ℝ^N, and let V be... 

12.12.2022, 10:15  –  Golm, Hs. 9, room 2.22 (and Zoom)
Forschungsseminar Statistik

Optimal reach estimation via metric learning

Clément Berenfeld

Abstract: In manifold learning, the reach is an ubiquitous regularity parameter that encompasses the well-behavior of the support of the underlying probability measure. Enforcing a reach constraint... 

09.12.2022, 10:15 - 11:15  –  Campus Golm, Building 28, Room 0.108
SFB-Kolloquium

One-shot Learning of Surrogates in PDE-constrained Optimization Under Uncertainty

Claudia Schillings, Freie Universität Berlin

Approaches to decision making and learning mainly rely on optimization techniques to achieve “best” values for parameters and decision variables. In most practical settings, however, the optimization... 

09.12.2022, 11:00  –  Raum 2.22 + Zoom
Arbeitsgruppenseminar Analysis

CCR-representations of symplectic vector spaces

Nicolas Ginoux (Université de Lorraine, Metz)

We present the construction of the so-called CCR-representation of any given symplectic vector space. We shall follow Section 4.2 in the book "Wave equations on Lorentzian manifolds and quantization"... 

08.12.2022, 14:15-15:45  –  2.22 und Zoom
Geometric Analysis, Differential Geometry and Relativity

Global hyperbolicity through the eyes of the null distance

Leonardo Garcia Heveling

Can one encode the causal information of a spacetime in a metric space structure? In 2016, Sormani and Vega conjectured how this may be done. In this talk, I will present some recent results... 

07.12.2022, 15:00 (unusual!)  –  Campus Golm, Haus 9, Raum 2.22 + Zoom
Institutskolloquium

Two combinatorial viewpoints on geometry

Christian Haase, FU Berlin and Federico Ardila, San Francisco State University

15:00 Christian Haase: Lattice Point Semigroups — Toric and Non-Toric

15:45 Tee und Kaffee Pause

16:15 Federico Ardila: Combinatorial Intersection Theory: Three Examples

Wenn Sie digital an den... 

07.12.2022, 13:00  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

Random simplicial complexes of top bounded degree

Prof. Ron Rosenthal (Technion)

Abstract: In the talk we will introduce a model for random simplicial complexes which are high-dimensional counterparts of random regular graphs.

We will present some results for such random complexes... 

02.12.2022, 11:00  –  Raum 2.22 + Zoom
Arbeitsgruppenseminar Analysis

The Milnor Moore and Poincaré Birkhoff Witt theorems in the locality context

Diego López (Uni Potsdam)

In this talk, we will present a locality version of two celebrated structural theorems of Hopf algebras and universal enveloping algebras, namely the Milnor-Moore theorem and the... 

01.12.2022, 14:15-15:45  –  2.22 und Zoom
Geometric Analysis, Differential Geometry and Relativity

Ancient Solutions of Ricci flow with Type I curvature growth

Andoni Royo Abrego

Ancient solutions of geometric flows such as Ricci flow and Mean curvature flow arise naturally as models for singularity formation. There has been significant progress towards the classification of... 

01.12.2022, 16:00  –  Raum 1.10
Forschungsseminar Differentialgeometrie

Inversion of Radon transform and applications to microlocal regularity

Rubens Longhi (UP)

We aim at extending the classical notion of smooth wavefront set employing the Radon transform in order to capture different degrees of lack of -regularity of a... 

30.11.2022, 13:30  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

Computing nodal deficiency with a refined spectral flow

Bernard Helffer (Nantes Université)

in collaboration with

G. Berkolaiko, G. Cox, and  M. Persson Sundqvist 

Abstract
Recent work of the authors and their collaborators has uncovered fundamental connections between the... 

28.11.2022, 13:00  –  Campus Golm, Haus 9 Raum 2.22
Forschungsseminar Wahrscheinlichkeitstheorie

Relaxed formulation for the control of branching diffusions: Existence of an optimal control and HJB equation.

Antonio Ocello (Sorbonne-univ., Paris)

We study the existence of optimal control for branching diffusion processes. The considered problem use rewards that can be nonlinear in the final payoff and linear in the running payout. We give a... 

28.11.2022, 14:00  –  Zoom
Forschungsseminar Statistik

Benign overfitting and adaptive nonparametric regression

Julien Chhor

Abstract:
Benign overfitting is a counter-intuitive phenomenon recently discovered in the deep-learning community. In specific cases, it has been experimentally observed that deep neural networks can... 

25.11.2022, 11:00  –  Raum 2.22 + Zoom
Arbeitsgruppenseminar Analysis

Index Theory in sub-Riemannian Geometry via Stochastic Methods

Gianmarco Vega-Molino (Uni Bergen)

In the field of Riemannian geometry, the incredible Gauss-Bonnet theorem was the starting point for Index Theory, arguably one of the most important and successful endeavors in modern differential... 

24.11.2022, 14:15-15:45  –  2.22 und Zoom
Geometric Analysis, Differential Geometry and Relativity

Some inequalities involving the ADM mass via linear and nonlinear potential theory

Francesca Oronzio

In this talk, we describe some monotonicity formulas holding along the level sets of suitable p–harmonic functions in asymptotically flat 3–manifolds with a single end, either with or without... 

23.11.2022, 14:00  –  Golm, Haus 9, Zimmer 2.22
Institutskolloquium

Two perspectives on the geometry of Ricci-flat manifolds

Bernd Ammann, Uni Regensburg und Klaus Kröncke, KTH, Stockholm

14:00 Bernd Ammann (Uni Regensburg): From Pythagorean triples to constant mean curvature surfaces

14:45 Tee und Kaffee Pause

15:15 Klaus Kröncke (KTH, Stockholm): From the heat flow to the Ricci flow:... 

21.11.2022, 10:15  –  Campus Golm, Building 9, Room 2.22 and Zoom
Forschungsseminar Statistik

Bandit-Algorithms for Data Sampling

Karen Seidel (UP)

Abstract:    In machine learning, algorithms generalize from available training data to unseen situations. The engineering practices used in the respective technologies are far from understood.... 

21.11.2022, 14:00  –  Campus Golm, Haus 9, Raum 2.22 & Zoom
Forschungsseminar Wahrscheinlichkeitstheorie

1/3 scaling exponent and non-gaussian limit laws

Peter Nejjar (Bonn Uni./Potsdam Uni.)

The standard CLT is characterized by a fluctuation exponent of one half and a gaussian limit distribution. We will discuss several examples, e.g. of random growth models and interacting paticle... 

18.11.2022, 11:00  –  Campus Golm, Haus 9, Raum 2.22 + Zoom
Arbeitsgruppenseminar Analysis

Traces on pseudodifferential operators on the noncommutative torus

Carolina Neira (Universidad Nacional, Bogotá)

On closed manifolds, there are functional traces on pseudodifferential operators, some of which appear in  noncommutative geometry.
The noncommutative residue, the Kontsevich and Vishik canonical... 

17.11.2022, 14:15-15:45  –  2.22 and Zoom
Geometric Analysis, Differential Geometry and Relativity

Uniqueness of (n+1)-dimensional black holes and equipotential photon surfaces in static vacuum

Albachiara Cogo (U Tübingen)

In this joint work with Cederbaum, Leandro and Dos Santos, we generalize to any dimension n+1 Robinson’s divergence formula used to prove the uniqueness of (3 + 1)-dimensional static black holes. To... 

16.11.2022, 13 Uhr  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

Spectrum of discrete Laplacian over an ordered field

Anna Muranova (University of Warmia)

Abstract:
We consider discrete normalized Laplacian for finite graphs, whose edge-weights belong to an arbitrary real-closed ordered field. We show that eigenvalues of Laplacian always belong to the... 

14.11.2022, 13:00  –  Campus Golm, Haus 9, Raum 2.22
Forschungsseminar Wahrscheinlichkeitstheorie

Penrose-stable Interactions in Classical Statistical Mechanics

Suren Poghosyan (Nat. Acad. of Science, Armenia)

For a pair potential Φ in a general underlying space X satisfying some natural and sufficiently general
conditions we define by means of the so called Ursell kernel a function r which is shown to be... 

11.11.2022, 10:15 - 11:15  –  Campus Golm, Building 28, Room 0.108
SFB-Kolloquium

Challenges of data driven modelling in cardiac dynamics

Ulrich Parlitz, Universität Göttingen

The myocardium is an electrically excitable medium that supports various types of excitation waves, including stable or chaotic spiral waves that cause life-threatening arrhythmias such as ventricular... 

11.11.2022, 11:00  –  Campus Golm, Haus 9, Raum 2.22 + Zoom
Arbeitsgruppenseminar Analysis

Multiple sums and integrals associated with planar Schröder trees and set compositions

Yannic Vargas (Universität Graz)

We investigate and compare two different ways of associating multiple sums and multiple integrals to a certain class of planar rooted trees (Schröder trees). These give rise to characters on the... 

10.11.2022, 16:00  –  Raum 1.10
Forschungsseminar Differentialgeometrie

Seeley's 'Complex Powers of an Elliptic operator'

Alberto Richtsfeld (UP)

In this talk, I will review Seeley's groundbreaking paper 'Complex Powers of an Elliptic Operator'. In this paper, he defines complex powers of an elliptic, classical pseudo-differential operator... 

07.11.2022, 13:00  –  Campus Golm, House 9, Room 2.22
Forschungsseminar Wahrscheinlichkeitstheorie

On Stochastic Differential Equations with Jumps of Marcus-Type

Martha Nansubuga (HU Berlin)

We study stochastic differential equations (SDEs) driven by semimartingales with jumps, where the jumps of the solution are obtained as small relaxation time limits of fast curvilinear motions along... 

04.11.2022, 11:00  –  Campus Golm, Haus 9, Raum 2.22 + Zoom
Arbeitsgruppenseminar Analysis

The noncommutative torus as a Rieffel deformation

Carolina Neira (Universidad Nacional, Bogotá)

In this talk we will view the noncommutative torus as a deformation of an appropriate C*-algebra following Rieffel's definitions, and define pseudodifferential operators on this quantum space.

First... 

04.11.2022, 14:15  –  Room 2.22 (Zoom stream)
Öffentlicher Vortrag

Condensed Mathematics

Peter Scholze (MPI Bonn)

Zoom stream of talk taking place at HU Berlin

One of the central notions of mathematics is the notion of a topological space: it captures the idea of a space with a notion of "nearness" of points.... 

03.11.2022, 14:00-15:30  –  1.22 und Zoom
Geometric Analysis, Differential Geometry and Relativity

2D limit models in nonlinear elasticity: membranes, plates and Willmore surfaces

Claudia Grabs

Elastic deformations of thin plates include stretching, shearing and compression, as well as bending. As the thickness of the plate goes to zero, different limit theories arise, depending on the... 

02.11.2022, 13:30  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

An improved discrete Rellich inequality on the half-line

Borbola Gerhat (Prague)

Abstract

28.10.2022, 11:00  –  Raum 2.22 + Zoom
Arbeitsgruppenseminar Analysis

Geometry for the continuous field of controlled rough paths

Alexander Schmeding (Nord Universitet, Norway)

In rough path theory one seeks to solve differential equations driven by rough signals (i.e. Hölder paths of low regularity). To this end one needs to take a close look at the technical setup enabling... 

27.10.2022, 14:00-15:30  –  2.22 und Zoom
Geometric Analysis, Differential Geometry and Relativity

Causal Structure at Infinity and the Positive Mass Theorem

Peter Cameron

A spacetime is said to satisfy the Penrose property if every pair of points on past and future null infinity can be connected by a timelike curve. Penrose showed that this property fails in Minkowski... 

27.10.2022, 16:00  –  Raum 1.10
Forschungsseminar Differentialgeometrie

Index of Dirac operator on a globally hyperbolic spacetime with timelike boundary

Onirban Islam (UP)

The Atiyah-Singer index theorem is one of the monumental results in Mathematics of the last century. Various extensions of this theorem in the context of Riemannian geometry are available but a... 

26.10.2022, 8:00  –  Campus Golm, Haus 9, Raum 2.22 + Zoom
Öffentlicher Vortrag

Quantum inequalities

Daniela Cadamuro (Uni Leipzig)

In quantum theory, certain observables may yield negative values even if their classical counterparts are nonnegative. This applies in particular to the averaged energy density in quantum field... 

26.10.2022, 13:00  –  Campus Golm, Haus 9, Raum 2.22 + Zoom
Öffentlicher Vortrag

Ein neuer Zugang zur Hot-Spots-Vermutung

Assoc.-Prof. Dr. Jonathan Rohleder (Stockholm University)

Die Hot-spots-Vermutung wurde 1974 von J. Rauch formuliert: der heißeste und kälteste Punkt in einem isolierten, homogenen Medium sollte für “die meisten” Anfangs-Wärmeverteilungen zum Rand... 

26.10.2022, 4:00 pm  –  Golm, Haus 9, Raum 1.22
SIAM Chapter Seminar

Higher Order Laplacians on Simplicial Complexes

Philipp Bartmann

Abstract: As higher dimensional analogues of graphs, simplicial complexes appear in many areas of mathematics such as topology, combinatorics, data analysis and number theory. However, it is still... 

26.10.2022, 13:00  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

A view on multiple recurrence

Tanja Eisner (Leipzig)

Abstract: We discuss a proof of multiple recurrence for ergodic systems (and thereby of Szemerédi's theorem) being a mixture of three known proofs. It is based on a conditional version of the... 

25.10.2022, 8:00  –  Campus Golm, Haus 9, Raum 2.22 + Zoom
Öffentlicher Vortrag

Semiklassische Limiten durch maßgeschneiderte Pseudodifferenzialkalküle — Anwendungen auf Systeme ohne und mit Dissipation

Max Lein (Tohoku University)

Physikalisch gesehen verhalten sich mikroskopische, quantenmechanische Systeme vollkommen anders als makroskopische, klassische Systeme. Weil aber Quantenmechanik die grundlegendere physikalische... 

25.10.2022, 10:15  –  Campus Golm, Haus 9, Raum 2.22 + Zoom
Öffentlicher Vortrag

Irreversibility and Stability in Statistical Physics

Dr. Helge Dietert (Université Paris Cité und Sorbonne Université)

In statistical physics, an irreversible macroscopic behaviour can emerge from a reversible model through mixing by a transport operator (Landau damping). I will show how this can be captured... 

25.10.2022, 13:00  –  Campus Golm, Haus 9, Raum 2.22 + Zoom
Öffentlicher Vortrag

Topological insulators via coarse geometry

Matthias Ludewig (Uni Regensburg)

Topological insulators are certain materials or metamaterials featuring a topological non-triviality in their mathematical description. This feature typically manifests as a non-trivial class in the... 

24.10.2022, 13:00  –  Campus Golm, Haus 9, Raum 2.22
Forschungsseminar Wahrscheinlichkeitstheorie

Weakly self-avoiding walk in a random potential

Willem van Zuijlen (WIAS, Berlin)

We investigate a model of simple-random walk paths in a random environment that has two competing features: an attractive one towards the highest values of a random potential, and a self-repellent one... 

24.10.2022, 8:00  –  Campus Golm, Haus 9, Raum 2.22
Öffentlicher Vortrag

Lorentzian length spaces - a synthetic approach to Lorentzian geometry

PD Dr. Clemens Sämann (University of Oxford)

I will introduce a synthetic approach to Lorentzian geometry akin to Alexandrov- or CAT(k)-spaces in metric geometry. The role of the metric is taken over by the time separation function, in terms of... 

24.10.2022, 10:10  –  Campus Golm, Haus 9, Raum 2.22 + Zoom
Öffentlicher Vortrag

Mathematics of Hearing the Shape of a Drum

Prof. Dr. Julie Rowlett (TU Chalmers, Schweden)

Have you heard the question "Can one hear the shape of a drum?" Do you know the answer? In 1966, M. Kac's article of the same title popularized the inverse isospectral problem for planar domains.... 

24.10.2022, 15:00  –  Campus Golm, Haus 9, Raum 2.22 + zoom
Öffentlicher Vortrag

Die Geometrie von molekularen Schrödinger-Operatoren

Prof. Dr. Batu Güneysu (TU Chemnitz)

Ein klassisches Resultat von Kato besagt, dass die Eigenfunktionen eines molekularen Schrödinger-Operators global α-hölderstetig sind, für alle Hölderexponenten α≤1. Insbesondere folgt hieraus, dass... 

24.10.2022, 12:50  –  Campus Golm, Haus 9, Raum 2.22 + Zoom
Öffentlicher Vortrag

Über zeitharmonische Lösungen der Maxwellschen Gleichungen und verwandte Probleme der Fourier-Restriktionstheorie

PD Dr. Rainer Mandel (Karlsruher Institut für Technologie)

Die Maxwell’schen Gleichungen beschreiben die Ausbreitung elektromagnetischer Wellen in Abhängigkeit von Materialeigenschaften des Mediums und potentiell vorliegenden Ladungen und Strömen. In meinem... 

24.10.2022, 17:10  –  Campus Golm, Haus 9, Raum 2.22 + Zoom
Öffentlicher Vortrag

Mathematical structures underlying perturbative quantum field theory

Dr. Kasia Rejzner (York University)

In this talk I will present a mathematically rigorous framework for perturbative quantum field theory. This framework, called perturbative algebraic quantum field theory (pAQFT), combines the idea of... 

21.10.2022, 10:15 - 11:15  –  Campus Golm, Building 28, Room 0.108
SFB-Kolloquium

Using 'Data-Intelligence' to Understand the Physics of the Inner Magnetosphere

Geoff D. Reeves, Los Alamos National Laboratory, USA

The Earth’s magnetosphere is a complex system composed of about a dozen major subsystems that are not only complex in-and-of themselves but also interconnected in complex, sometimes nonlinear ways. In... 

21.10.2022, 10:00 ungewöhliche Zeit  –  Campus Golm, Haus 9, Raum 2.22 + Zoom
Arbeitsgruppenseminar Analysis

Pseudodifferential Operators on the Noncommutative Torus

Carolina Neira (Universidad Nacional, Bogotá)

The noncommutative torus (NCT), or quantum torus, which is a mild noncommutative perturbation of the ordinary torus, is a prototypical object in noncommutative geometry.
Our main aim in this talk is... 

20.10.2022, 16:15  –  Raum 1.10
Forschungsseminar Differentialgeometrie

A generalization of the microlocal regularity theorem

Rubens Longhi (UP)

The theorem of microlocal elliptic regularity is useful to determine the singularities of the solution of linear partial differential equations on manifolds. It states that if is a linear... 

20.10.2022, 14:00-15:30  –  2.09.2.22, Zoom
Geometric Analysis, Differential Geometry and Relativity

Recent Estimates on the Bartnik mass

Annachiara Piubello (Universitiy of Miami)

In this talk, we will discuss some recent estimates on the Bartnik mass for data with non-negative Gauss curvature and positive mean curvature. In particular, if the metric is round the estimate... 

12.10.2022, 17:30  –  Campus Golm, Haus 25, Hörsaal F1.01
Öffentlicher Vortrag

Towards Characterisation, Design and Function of 3D Entangled Materials

Prof. Dr. Myfanwy Evans

Hochschulöffentlicher Vortrag im Rahmen des Perspektivverfahrens von Prof Evans, Professorin für Angewante Geometrie und Topologie am Institut für Mathematik.

11.10.2022, 9:45-10:15  –  Haus 9, Raum 2.22
Verteidigung Masterarbeit / Master's Thesis Defence

Mathematikunterricht im Nationalsozialismus

Frau Melanie Trudrung

Konnte der Mathematikunterricht zur Vermittlung der nationalsozialistischen Ideologie überhaupt genutzt werden?... 

28.09.2022, 4:00 pm  –  Golm, House 9, Room 1.22
SIAM Chapter Seminar

Optimal -Hardy Weights on Locally Finite Graphs

Florian Fischer

Abstract: A natural classification of random walks is the one into recurrent and transient ones. This is equivalent to the non-/validity of the Hardy inequality for the energy functional associated... 

26.09. bis 30.09.2022  –  Golm, Haus 9, Raum 2.22
Workshop

Geometry and Renormalisation Workshop

In recent decades, the search for a fundamental understanding of renormalization methods in quantum field theory has led to new mathematical structures and tools in various areas of mathematics,... 

19.09. bis 21.09.2022  –  Campus Griebnitzsee, Building 6
Konferenz

Symposium on Inverse Problems: From experimental data to models and back - SFB Potsdam DA Days

The joint ‘Symposium on Inverse Problems: From experimental data to models and back’, is co-organized by the SFB 1456 Mathematics of Experiment, SFB 1294 Data Assimilation and the Gesellschaft für... 

19.09. bis 22.09.2022  –  Potsdam
Workshop

Workshop on Functional Analysis, Operator Theory and Dynamical Systems

Organizers

• Ram Band (Israel Institute of Technology)
• Siegfried Beckus (University of Potsdam)
• Jonathan Breuer (Hebrew University)
• Matthias Keller (University of Potsdam)
• Daniel Lenz... 

13.09. bis 14.09.2022  –  Campus Griebnitzsee, Building 6
SFB 1294 - Annual Meeting

SFB Annual Meeting

tba

30.08.2022, 10:15  –  Campus Golm, Building 25, Room F0.01
Kálmán Lecture

5th Kálmán Lecture with Nicolas Chopin

Nicolas Chopin , ENSAE, Institut Polytechnique de Paris, France

Nested cubing integration: how to get a O(N^{-10}) error when you compute your favourite integral

This talk will explain why computing integrals remains such an important task in applied mathematics,... 

29.07.2022, 11:30 (mind time)  –  Golm, Haus 9, 2.22 und online
Arbeitsgruppenseminar Analysis

The biharmonic Steklov operator on differential forms

Georges Habib (Lebanese University, Beirut)

In this talk, we shall introduce the notion of  biharmonic Steklov operator, which we then extend  to differential forms. The definition is motivated by the extension of the Serrin problem to... 

28.07.2022, 16:15  –  Raum 0.14
Forschungsseminar Differentialgeometrie

Local index theory for Lorentzian manifolds

Christian Bär

We prove a local version of the index theorem for Dirac-type operators on globally hyperbolic Lorentzian manifolds with Cauchy boundary. In case the Cauchy hypersurface is compact, we do not assume... 

22.07.2022, 14:00 ungewöhnlich  –  Online Seminar
Arbeitsgruppenseminar Analysis

Lineup polytopes in physics

Federico Castillo (Catholic University of Chili)

Motivated by an instance of the quantum marginal problem in physics, we define the r-lineup polytope of P as a polytope parametrizing all possible linear orders on the vertices of P. We focus on the... 

21.07. bis 21.07.2022, 14:00-15:30  –  C6H05 Tübingen, 2.09.2.22 Campus Golm
Geometric Analysis, Differential Geometry and Relativity

Solving initial data for Kaluza-Klein spacetimes

Caterina Vâlcu

We study the constraint equations for Einstein equations on manifolds of the form $\mathbb{R}^{n+1}\times T^m$, where $T^m$ is a flat m-dimensional torus. Spacetimes with compact directions were... 

15.07.2022, 11:00  –  Online Seminar
Arbeitsgruppenseminar Analysis

A Young-type Euler-Maclaurin Formula

Carlo Bellingeri (TU Berlin)

Considered one of the key identities in classical analysis, the Euler-McLaurin formula is one of the standard tool to relate sums and integrals, with remarkable applications in many areas of... 

14.07. bis 14.07.2022, 14:00-16:00  –  C6H05 Tübingen, 2.09.2.22 Campus Golm
Geometric Analysis, Differential Geometry and Relativity

Construction and properties of free boundary minimal surfaces

Giada Franz

A free boundary minimal surface (FBMS) in a given three-dimensional Riemannian manifold is a critical point of the area functional with respect to variations that constrain its boundary to the... 

14.07.2022, 14:00-16:00  –  C6H05 Tübingen, 2.09.2.22 Campus Golm
Geometric Analysis, Differential Geometry and Relativity

Free boundary minimal surfaces in the unit ball

Mario Schulz

The case of the Euclidean unit ball as ambient manifold for free boundary minimal surfaces arises naturally in the study of extremal metrics for Steklov eigenvalues on surfaces with boundary and is
... 

14.07.2022, 16:00  –  2.09.0.14
Forschungsseminar Differentialgeometrie

Geometry of Lie Groups

Christian Bär

mehr erfahren

13.07.2022, 14:00  –  Online Meeting
Institutskolloquium

The Kinetic Theory of a Plasma

Mikaela Iacobelli (ETH Zurich) und Toan Nguyen (Penn State University)

14:00 Mikaela Iacobelli (ETH Zurich): Stability and singular limits in plasma physics

15:15 Toan Nguyen (Penn State University): Landau damping in plasma physics

Wenn Sie digital an den Vorträgen... 

13.07.2022, 13:30  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

On some Mathematical Systems Theory in Banach spaces.

Christian Seifert (Technische Universität Hamburg)

Abstract: Given an abstract Cauchy problem in a Banach space we consider two questions:
1. Can we steer the system to any given state (or to zero, say) in finite time by some inhomogeneity?
2. Can we... 

13.07.2022, 11:00  –  Online Seminar
Arbeitsgruppenseminar Analysis

Multiple sums and integrals associated with planar rooted trees

Yannic Vargas (Weierstrass Institute)

We investigate and compare two different ways of associating  multiple sums and multiple integrals to a certain class  of planar rooted trees (Schröder trees). These give rise to characters on the... 

11.07.2022, 10:00  –  Campus Golm, 2.09.2.22 (hybrid)
Forschungsseminar Statistik

Nonparametric estimation of the Lévy density

Céline Duval (Université de Lille)

We consider the problem of estimating the Lévy density of a pure jump Lévy process, possibly of infinite variation, from the high frequency observation of one trajectory. To directly construct an... 

08.07.2022, 10:15-11:15  –  Campus Golm, Building 28, Room 0.108
SFB-Kolloquium

Symmetry-informed model inference for active matter

Jörn Dunkel, Massachusetts Institute of Technology, USA

Recent experimental advances enable high-resolution observations of biological and synthetic active matter across a wide range of length and time scales. A major interdisciplinary challenge is to... 

08.07.2022, 11:00  –  Online seminar
Arbeitsgruppenseminar Analysis

Planar branched zeta values and associated multiple sums and integrals

Yannic Vargas (Weierstrass Institute)

We investigate and compare two different ways of associating  multiple sums and multiple integrals to a certain class  of planar rooted trees (Schröder trees). These give rise to characters on the... 

07.07. bis 07.07.2022, 14:00-16:00  –  C6H05 Tübingen, 2.09.2.22 Campus Golm
Geometric Analysis, Differential Geometry and Relativity

Stability of the Spacetime Penrose Inequality in the AF Spherically Symmetric Case

Emily Schaal

We formulate the almost rigidity statement associated with the spacetime version of Penrose inequality, and establish it under the assumption of spherical symmetry in all dimensions. In particular, it... 

07.07.2022, 16:00  –  2.09.0.14
Forschungsseminar Differentialgeometrie

Order-preserving isomorphisms of algebras of pseudo-differential operators

Alessandro Contini (Leibniz University Hanover)

In 1971 Egorov proved his famous Theorem, stating that conjugating a pseudo-differential operator with an invertible Fourier Integral Operator produces a new DO with the same principal symbol.... 

06.07.2022, 13:30  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

Semi-linear elliptic inequalities on weighted graphs

Xueping Huang (Nanjing University)

Abstract: We consider the discrete analogue of  semi-linear differential inequalities on weighted graphs. Under some technical conditions, we obtain almost sharp volume growth criteria for the... 

04.07.2022, 10:00  –  Campus Golm, 2.09.2.22 (hybrid)
Forschungsseminar Statistik

About a data-based tight frame

Franziska Göbel

Function systems are widely used in mathematics to adress various questions like approximation, compressing and denoising of functions. Famous examples are the Fourier basis and wavelets which are... 

01.07.2022, 10:30 - 11:30  –  Campus Golm, Building 28, Room 0.108
SFB-Kolloquium

Additional SFB Colloquium with Mercator Fellows Sean Meyn and Youssef M. Marzouk

Sean Meyn (University of Florida) and Youssef M. Marzouk (MIT)

A Not So Random Walk around Extremum Seeking Control  - Sean Meyn

How can you optimize a function based on observations, without any way of computing a gradient? Kiefer and Wolfowitz proposed a... 

01.07.2022, 11:00  –  Golm, Haus 9, 2.22 und online
Arbeitsgruppenseminar Analysis

Orthogonal and special linear invariants of paths via the iterated-integral signature

Rosa Preiss (University of Potsdam)

Looking at the action of the orthogonal group on a path in a finite dimensional real vector space, we apply Fels-Olver’s moving frame method paired with the log-signature transform to construct a set... 

30.06. bis 30.06.2022, 14:00-16:00  –  C6H05 Tübingen, 2.09.2.22 Campus Golm
Geometric Analysis, Differential Geometry and Relativity

The MOTS-stability spectral problem: when `non-normal' is generic

José Luis Jaramillo

The spectral theorem provides a powerful tool to study physical systems 
controlled by a self-adjoint or, more generally, normal operator. The situation changes  qualitatively when the normal... 

29.06.2022, 14:00  –  Campus Golm, Haus 9, Raum 2.22 + Zoom
Institutskolloquium

Open access scientific publications

Marie Farge (ENS, Paris) und Dieter Meschede (DPG, Bonn)

14:00 Marie Farge (ENS, Paris): The Diamond Open Access: a model for researchers and funding agencies to recover control of their articles

14:45 Tee und Kaffee Pause

15:15 Dieter Meschede (DPG, Bonn):... 

29.06.2022, 4:00 pm  –  Golm, Haus 9, Raum 0.17
SIAM Chapter Seminar

Stochastic differential equations - application, simulation and parameter estimation

Jan Martin Nicolaus

Abstract:

Differential equations are ubiquitous throughout most topics of applied mathematics, physics and engineering.

The study of stochastic differential equations (SDEs) enables the modeling and... 

29.06.2022, 13:30  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

Leptin densities in amenable groups

Christoph Richard (Erlangen)

Abstract: We define a notion of uniform density on translation bounded measures in unimodular amenable locally compact Hausdorff groups, which is based on a group invariant introduced by Leptin in... 

23.06.2022, 16:00  –  Raum 0.14
Forschungsseminar Differentialgeometrie

A Gutzwiller Trace formula for Dirac Operators on a Stationary Spacetime

Onirban Islam

A Duistermaat-Guillemin-Gutzwiller trace formula for a Dirac-type operator D on a globally hyperbolic spatially compact standard stationary spacetime  is achieved by generalising the recent... 

23.06. bis 23.06.2022, 14:00-15:30  –  C6H05 Tübingen, 2.09.2.22 Campus Golm
Geometric Analysis, Differential Geometry and Relativity

Higher-dimensional Majumdar-Papapetrou black holes

James Lucietti

The uniqueness theorems for asymptotically flat, static, black hole solutions to Einstein-Maxwell theory in four and higher dimensions are only valid for non-extreme black holes.  

In the extreme case... 

22.06.2022, 13:30  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

Non-stationary Furstenberg Theorem and Anderson Localization

Anton Gorodetski (UCI)

Abstract: In this talk we will formulate a non-stationary version of the Furstenberg Theorem on random matrix products. As a main application we will discuss how it can be used to prove a... 

21.06.2022, 13:00  –  Raum 2.22 Haus 9, Golm
Forschungsseminar Wahrscheinlichkeitstheorie

Introduction to Hawkes Processes

Laetitia Colombani (U Toulouse)

Hawkes processes were introduced by Hawkes in 1971, and are widely used in many applications (earthquakes, neurons, social network, finance, etc.) They are random point processes on the real line, and... 

20.06.2022, 10:00  –  Golm, Haus 9 Raum 2.22 + Zoom
Forschungsseminar Statistik

Structured Pure Exploration Bandit Problems

James Cheshire

We will consider several multi armed bandit problems (MAB), with a focus on structured, pure exploration bandit problems. We will first identify the minimax rate for the Thresholding Bandit Problem... 

17.06.2022, 10:15-11:30  –  Campus Golm, Building 28, Room 0.108
SFB-Kolloquium

Collective dynamics in the social and data science

Marie-Therese Wolfram, University of Warwick, UK

Collective dynamics can be observed in many situations in our daily lives, for example the motion of bird flocks, the formation of directional lanes in pedestrian flows or opinion dynamics on social... 

16.06.2022, 16:00  –  Raum 0.14
Forschungsseminar Differentialgeometrie

On the spectrum of the Rarita-Schwinger operator on the Berger Spheres

Peter Grabs (UP)

We look at what might be involved in determining the above.

15.06.2022, 14:00  –  Campus Golm, Haus 9, Raum 2.22 + Zoom
Institutskolloquium

Vorstellungen und Lernpfade von Schülerinnen und Schülern zur Geometrie

Kirstin Erath (Uni Halle) und Alexander Salle (Uni Osnabrück)

14:00 Kirstin Erath (Uni Halle): Herausforderungen auf dem Lernpfad zum Ähnlichkeitsbegriff

14:45 Tee und Kaffee Pause

15:15 Alexander Salle (Uni Osnabrück): Grundvorstellungen und individuelle... 

13.06.2022, 13:00  –  Haus 9, Raum 2.22
Forschungsseminar Wahrscheinlichkeitstheorie

Convergence of Random Walks towards Skew Brownian motion

Andrey Pilipenko (Acad. of Science, Kyiv)

We consider the random motion of a particle, whose jumps outside of a bounded set (membrane) are mean-zero i.i.d.  with a finite second moment. Jumps from the membrane have other finite mean... 

13.06.2022, 10:00  –  Golm, Haus 9, Raum 2.22 (hybrid: Zoom)
Forschungsseminar Statistik

Empirical Graph-Laplace-Approximation of Laplace-Beltrami Operators: Behavior of Eigenspaces

Maximilian Graf

The Laplacian Eigenmaps algorithm as a non-linear dimensionality reduction method was introduced by Belkin and Niyogi in 2001. Key objects are the Graph-Laplace-Matrix and the related... 

03.06.2022, 11:00  –  Online Seminar
Arbeitsgruppenseminar Analysis

Comparison of (co)symbols of pseudodifferential operators on filtered manifolds

Shantanu Dave (University of Vienna)

A filtered manifold is a manifold with a graded (noncommutative) group structure on its tangent space. These include familiar examples of foliations and contact structures. The new group structure on... 

02.06.2022
Berlin-Brandenburgisches Seminar Mathematik und ihre Didaktik

mehr erfahren

02.06. bis 02.06.2022, 14:00-15:30  –  C6H05 Tübingen, 2.09.2.22 Campus Golm
Geometric Analysis, Differential Geometry and Relativity

Huisken-Yau-type uniqueness for area-constrained Willmore spheres

Jan Metzger

Let (M, g) be a Riemannian 3-manifold that is asymptotic to Schwarzschild. We study large area-constrained Willmore spheres $\Sigma\subset M$ with non-negative Hawking mass and inner radius $\rho$... 

31.05.2022, 12:30  –  Golm, Haus 9, Raum 2.22
Forschungsseminar Wahrscheinlichkeitstheorie

Percolation of the level set of the Gaussian Free Field on a Galton-Watson tree.

Gioele Gallo (Köln)

The study of Gaussian free field level sets on supercritical Galton-Watson trees has been initiated by Abächerli and Sznitman. We continue this investigation by means of different tools in order to... 

31.05.2022, 13:00 Uhr  –  Haus 29, Raum 0.25/0.26 (Präsenzveranstaltung)
Berlin-Brandenburgisches Seminar Mathematik und ihre Didaktik

Disputation Maximilian Schanner

Maximilian Schanner

Liebe Kolleginnen, liebe Kollegen,

ich möchte Sie auf folgende Veranstaltung hinweisen:

Verteidigung der Doktorarbeit von

Maximilian Schanner

"Correlation based modeling of the archeomagnetic... 

30.05.2022, 10:00  –  hybrid (room 2.9.2.22 and on zoom)
Forschungsseminar Statistik

Statistics at the IQTIG - Analyzing Health Care Data

Maurilio Gutzeit

We start with a short introduction to the IQTIG (Institut für Qualitätssicherung und Transparenz im Gesundheitswesen) as a key player in quality insurance in the German health care system and to the... 

30.05.2022, 13:00  –  Golm, Haus 9 Raum 2.22
Forschungsseminar Wahrscheinlichkeitstheorie

Random Dynamics in Collective Behaviour - Consensus, Clustering and Extinction of Populations

Jens Fischer (Toulouse, UP)

Social network models are a common tool to further the understanding of relation based interactions in societies. Nonetheless, a complete mathematical understanding is lacking due to the complexity of... 

25.05.2022, 16:00  –  Campus Golm, building 9, room 0.17
SFB-Seminar

Learning in High-Dimensional Feature Spaces Using ANOVA-Based Fast Matrix-Vector Multiplication

Theresa Wagner, TU Chemnitz

Kernel matrices are crucial in many learning tasks and typically dense and large-scale. Depending on the dimension of the feature space even the compu- tation of all its entries in reasonable time... 

25.05.2022, 13:30  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

Laplacians on Riemann surfaces and Graphs

Noema Nicolussi (Potsdam)

There are many interesting parallels between analysis on Riemann surfaces and graphs. Both settings admit a Laplace operator and the Poisson equation reflects crucial geometric information.

Motivated... 

23.05.2022, 10:15  –  Golm Haus 9 Raum 2.22 (hybrid - zoom)
Forschungsseminar Statistik

Robust estimation of discrete distributions under local differential privacy

Julien Chhor

Joint work with Flore Sentenac (CREST)

Although robust learning and local differential privacy are both widely studied fields of research, combining the two settings is an almost unexplored topic. We... 

23.05.2022, 13:00  –  Campus Golm, Building 9, Room 2.22
Forschungsseminar Wahrscheinlichkeitstheorie

Population models with seed bank: construction, duality and tree properties

Marta Dai Pra (HU Berlin)

This talk focuses on the study of population models with a seed bank, in particular presenting their construction from classical models, some duality results and tree properties.The first part is an... 

20.05.2022, 14:15  –  Auditorium Maximum, Haus 8, Am Neuen Palais
Öffentlicher Vortrag

Euler Vorlesung 2022

Prof. Dr. Wolfgang Lück

Titel: A Panorama of L²-Invariants

Abstract: We give a gentle survey about L²-invariants such as L²-Betti numbers and L²-torsion. They are modelled on their classical counterparts and defined in terms... 

20.05.2022, 11:00  –  Campus Golm, Haus 9, Raum 2.22 + Zoom
Arbeitsgruppenseminar Analysis

An algorithm for distributing weight over a finite graph (and its relation with Shintani zeta functions)

Diego Lopez (Uni Potsdam)

In this talk we will describe an algorithm to distribute some "n-dimensional weight" over the vertices of a graph, such that the weight on each vertex remains higher than a given bound. We will then... 

19.05.2022, 16:00-17:30  –  2.09.0.14
Forschungsseminar Differentialgeometrie

Non-local boundary conditions for the Dirac operator on spacetimes with timelike boundary

Penelope Gehring

Non-local boundary conditions - for example the Atiyah-Patodi-Singer (APS) conditions -  for Dirac operators on Riemannian manifolds are rather well-understood, while not much is known for such... 

18.05.2022, 14:00  –  Campus Golm, Haus 9, Raum 2.22 + Zoom
Institutskolloquium

Amenability — From the Banach-Tarski paradoxon to Gromov’s monster groups

Kristin Courtney (Uni Münster) und Siegfried Echterhoff (Uni Münster)

14:00 Kristin Courtney (Uni Münster): Approximations on Groups

14:45 Tee und Kaffee Pause

15:15 Siegfried Echterhoff (Uni Münster): Amenable group actions on spaces and operator algebras

Wenn Sie... 

18.05.2022, 13:30  –  Haus 9, Raum 0.17 und Zoom
Forschungsseminar Diskrete Spektraltheorie

Uniformity of cocycles

Prof. Daniel Lenz (Universität Jena)

Abstract: Uniformity of continuous SL(2,R) valued cocycles over uniquely dynamical systems has featured in various contexts. Walters asked in '86 whether every uniquely ergodic system admits a... 

18.05.2022, 13 Uhr  –  Golm, Haus 9, Raum 1.22 + Zoom
Verteidigung Dissertation / PhD Defence

Structure formation and identification in geometrically driven soft matter systems

Tobias Hain

Das Thema der von Tobias Martin Hain in der Wissenschaftsdisziplin " Mathematische Physik" eingereichten Dissertation lautet:

Structure formation and identification in geometrically driven soft matter... 

16.05.2022, 13:00  –  Campus Golm, Building 9 Room 2.22
Forschungsseminar Wahrscheinlichkeitstheorie

Bose-Einstein condensation: introduction and open problems

Alexander Zass (WIAS Berlin)

In this talk we present the open problem of Bose--Einstein condensation. In the first part, we provide a
historical background and some physical heuristics for this state of matter that was first... 

13.05.2022, 11:30 (unusual time!)  –  Campus Golm, Haus 9, Raum 2.22
Arbeitsgruppenseminar Analysis

An Euler-MacLaurin formula for polyhedra

Mateo Spriet (Uni Toulouse)

The classical Euler-MacLaurin formula links the sum over integers of a single variable real function with its integral. In their article "Local Euler-MacLaurin formula for polytopes", Nicole Berline... 

12.05.2022, 16:15-17:45  –  2.09.0.14
Forschungsseminar Differentialgeometrie

Feynman propagators for Wave-type and Dirac-type operators

Onirban Islam

It is a classic result that any normally hyperbolic operator on a globally hyperbolic spacetime admits unique advanced and retarded propagators. With the advent of quantum field theory, a new type of... 

12.05. bis 12.05.2022, 14:00-15:30  –  C6H05 Tübingen, 2.09.2.22 Campus Golm
Geometric Analysis, Differential Geometry and Relativity

Singularities in mean convex mean curvature flow

Stephen Lynch

A compact hypersurface in Euclidean space moving by its mean curvature necessarily forms a singularity in finite time. The shape of the hypersurface near a singularity is described by an ancient... 

12.05.2022, 15:00  –  Zoom Meeting
Arbeitsgruppenseminar Analysis

Modifications of Getzler's Grading Technique

Andrés Larrain Hubach (University of Dayton, Ohio)

Joint online scientific meeting with the American University of Beirut, Lebanese University in Fanar, and the University of Potsdam in the framework of the cooperation:
AT THE CONFLUENCE OF GEOMETRY,... 

11.05.2022, 12:15-13:15  –  Campus Golm, Building 9, Room 1.10
Forschungsseminar

Toward a unified framework for large scale imaging problems: Theory, applications, and potential issues

Hossein S. Aghamiry, Université Côte d'Azur, Geoazur, Valbonne, France

Visualizing and quantifying the properties of a medium using sparse indirect measurements is the final goal of all the imaging methods in different fields. In this quest, inverse theory and... 

09.05.2022, 13:00  –  Raum 2.22 und Zoom
Forschungsseminar Wahrscheinlichkeitstheorie

Order of the phase transition of a free Bose Gas

Anne Flöge (UP & WIAS Berlin)

We investigate the order of the phase transition in the free Bose gas and start with a criterion of a phase transition of order 2 for general q_k. Then we continue the analysis under a gamma... 

06.05.2022, 10:15-11:15  –  Campus Golm, Building 9, Room 0.12
SFB-Seminar

Stochastic Modelling with few Parameters

Philipp Meyer, UFS Data-centric Sciences, University of Potsdam

Simple stochastic models can describe the fluctuations of a time series. A good way to get a first impression of the data is to look at the mean squared displacement. It describes how strong the data... 

05.05.2022, 14:00-15:30  –  C6H05 Tübingen, 2.09.2.22 Campus Golm
Geometric Analysis, Differential Geometry and Relativity

Local foliations by critial surfaces of the Hawking energy and small sphere limit

Alejandro Penuela Diaz

The Hawking energy is one of the most famous local energies in general relativity, by using a Lyapunov Schmidt reduction procedure we construct  unique  local foliations of critical surfaces of the... 

03.05.2022, 12:15 - 13:15  –  Campus Golm, Building 9, Room 1.22 (time and location changed!)
Forschungsseminar

Krylov methods for solving parameterized linear systems

Siobhan Correnty (KTH Stockholm)

We consider parameterized linear systems of the form $A(\mu) x(\mu) = b$ for many different $\mu$, where $A(\mu)$ is large, sparse and nonsingular, with a nonlinear dependence on $\mu$. In this work... 

02.05.2022, 10:15  –  2.09.2.22 (hydrid - Zoom)
Forschungsseminar Statistik

Adversarial bandits with noisy side observations

Tomas Kocak

In this talk, we take a look at a partial-observability model for online learning problems where the learner, besides its loss, also observes some noisy feedback about the other actions, depending on... 

29.04.2022, 10:15-11:15  –  Campus Golm, Building 28, Room 0.108
SFB-Kolloquium

Time scales in early warnings: a probabilistic approach

Susanne Ditlevsen, Department of Mathematical Sciences, University of Copenhagen, Denmark

In recent years there has been an increasing awareness of the risks of collapse or tipping points in a wide variety of complex systems, ranging from human medical conditions, pandemics, ecosystems to... 

29.04.2022, 14:00 (unusual time!)  –  Online Meeting
Arbeitsgruppenseminar Analysis

Combinatorial Hopf Algebras and the Toric Variety of the Permutohedron

William Norledge (Penn State, US)

Abstract: We discuss a bimonoid structure on the toric variety of the permutohedron (=permutohedral space) with multiplication, resp. comultiplication, given by embedding, resp. projecting onto,... 

28.04.2022, 15:00  –  Online Meeting
Arbeitsgruppenseminar Analysis

Renormalization of Feynman amplitudes by multiple zeta regularization

Viet Dang (Université Paris Cité)

Joint online scientific meeting with the American University of Beirut, Lebanese University in Fanar, and the University of Potsdam in the framework of the cooperation:
AT THE CONFLUENCE OF GEOMETRY,... 

28.04. bis 28.04.2022, 14:00-15:30  –  C6H05 Tübingen, 2.09.2.22 Campus Golm
Geometric Analysis, Differential Geometry and Relativity

Symmetries in Hamiltonian systems and their impact on ODE and PDE problems

Sonja Hohloch

Hamiltonian systems are an important class of dynamical systems in mathematics, physics, and biology. In this talk, we will explain the impact and ramifications of an underlying S^1-symmetry on the... 

25.04.2022, 13:00  –  Raum 2.22 + Zoom
Forschungsseminar Wahrscheinlichkeitstheorie

Hydrodynamic limits of particle systems

Julian Kern (ENS Lyon, Potsdam)

The Symmetric Simple Exclusion Process (SSEP) is a very important toy model in particle systems. I will use it and related processes to showcase some ideas from the theory of hydrodynamic limits which... 

22.04.2022, 10:00-12:00  –  Campus Golm, Building 5, Room 1.10
SFB-Seminar

"Stochastic gradient descent in continuous time: discrete and continuous data" and "Augmenting Bayesian inference with possibility theory"

Jonas Latz (Heriot-Watt University, Edinburgh) & Jeremie Houssineau (University of Warwick, UK)

Jonas Latz:

Optimisation problems with discrete and continuous data appear in statistical estimation, machine learning, functional data science, robust optimal control, and variational inference. The... 

22.04.2022, 11:00  –  Online Seminar
Arbeitsgruppenseminar Analysis

Pseudodifferential operators and Lie algebroids

Alfonso Garmendia (Barcelona)

The abstract will follow.

You are welcome to invite your friends and colleagues to join us! If you wish to attend the talks, please contact Sylvie Paycha paycha@math.uni-potsdam.de for the login...