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A: Fachverband Atomphysik

A 13: Quantum meets gravity and metrology I

A 13.1: Hauptvortrag

Dienstag, 19. März 2013, 11:00–11:30, E 415

Does time exist in quantum gravity? — •Claus Kiefer — Universität zu Köln

Time is absolute in standard quantum theory and dynamical in general relativity. The combination of both theories into a theory of quantum gravity thus leads to a `problem of time'. In my talk, I shall investigate those consequences for the concept of time that can be drawn without a detailed knowledge of quantum gravity. The only assumptions are the experimentally supported universality of the linear structure of quantum theory and the recovery of general relativity in the classical limit. Among the consequences are the fundamental timelessness of quantum gravity, the approximate nature of a semiclassical time, and the correlation of entropy with the size of the Universe.

Ref.: C. Kiefer, arXiv:0909.3767 [gr-qc].