Phys. Rev. D 48, 1722–1735 (1993)Origin and measurement of time in quantum cosmologyReceived 1 April 1993; published in the issue dated 15 August 1993 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. © 1993 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.48.1722
DOI:
10.1103/PhysRevD.48.1722
PACS:
04.60.+n
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.