Clock Time and Entropy

Abstract

Testable conditional probabilities appear to be restricted to single hypersurfaces (marvelous moments) and depend only on stationary observables. Observable evolution, such as a change of entropy, should be expressed as a dependence upon clock time, not upon inaccessible coordinate time.

14 pages, plain TeX, report Alberta-Thy-12-93, To be published in {\it Physical Origins of Time Asymmetry,} Eds. J. J. Halliwell, J. Perez-Mercader, and W. H. Żurek, Cambridge University Press, Cambridge (1993)

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• Fundamental decoherence from relational time in discrete quantum gravity: Galilean covariance
• Consistent discrete gravity solution of the problem of time: a model
• Perspective-neutral approach to quantum frame covariance for general symmetry groups
• Cosmological Time, Entropy and Infinity
• The Arrow of Time and Correlations in Quantum Physics