Does time exist in quantum gravity?

Details Does time exist in quantum gravity? Does time exist in quantum gravity?

2009-09-21

arxiv.org/abs/0909.3767v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

10 pages, second prize of the FQXi "The Nature of Time" essay contest

Scientific paper

Time is absolute in standard quantum theory and dynamical in general relativity. The combination of both theories into a theory of quantum gravity leads therefore to a "problem of time". In my essay I shall investigate those consequences for the concept of time that may 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.

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