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

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

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 couples to relativistic quantum matter.

Rainer Verch (Universität Leipzig):  Quantum non-causality in spacetime may be not exclusively quantum.

Abstract:     There are several non-causal effects that have been attributed to quantum physics. These include the analogues of "closed timelike curve effects" in quantum circuits proposed by David Deutsch (D-CTC), and the "impossible measurements" in relativistic quantum field theory discussed by Raphael Sorkin. Based on previous work, it will be pointed out in the talk that the alleged non-causality features arise not only in quantum systems, but in the very same manner in systems that are described in the framework of classical (non-quantum) statistical mechanics or classical field theory. Therefore, although the said non-causality scenarios have been portrayed as pertaining to quantum systems or quantum fields, they are in fact not based on, nor characteristic of, the quantum nature of physical systems.
    

Hanno Gottschalk (TU Berlin):  How classical gravity couples to relativistic quantum matter.

Abstract:     The Semiclassical Einstein Equation (SCE) couples classical gravity to relativistic quantum matter described by quantum fields. In cosmological space-times, this equation simplifies considerably. In this talk, the SCE is interpreted as an infinite dimensional dynamical system thanks to a new description of the renormalization procedure for the (expected) energy-momentum tensor. We study the existence and uniqueness of global solutions and thereafter study special solutions with relevance to modern cosmology.
    

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