Origin and measurement of time in quantum cosmology

Details Origin and measurement of time in quantum cosmology Origin and measurement of time in quantum cosmology

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993phrvd..48.1722c&link_type=abstract

Physical Review D (Particles, Fields, Gravitation, and Cosmology), Volume 48, Issue 4, 15 August 1993, pp.1722-1735

Physics

7

Scientific paper

The notion of probabilistic time is used to explain the origin and possible measurement of time in the Unruh-Wald formulation of quantum gravity. It is shown how ideal and real clocks measure probabilistic time and how we can extract from the Universe a real clock. Afterward, it is also shown how probabilistic time can be endowed with the two fundamental properties of time: it is an ordering parameter and it is ``Heraclitian.'' We discuss the correlation between the different arrows of time with the quantum arrows defined by the real clock.

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