Does time exist in quantum gravity?

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 investigate those consequences for the concept of time that may be drawn without a detailed knowle...

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Published inZagadnienia Filozoficzne w Nauce (Online) Vol. 59; no. 59; pp. 7 - 24
Main Author Kiefer, Claus
Format Journal Article
LanguageEnglish
German
Published Copernicus Center Press 01.12.2015
Subjects
arrow of time
cosmology
entropy
Philosophy of Science
quantum gravity
entropy
cosmology
quantum gravity
arrow of time
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Summary: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 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.
ISSN:0867-8286
2451-0602