Will entropy decrease if the Universe recollapses?

Don N. Page
Phys. Rev. D 32, 2496 – Published 15 November 1985
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Abstract

Hawking has proposed a wave function for the Universe which is CPT invariant and which appears to be dominated by smooth configurations when the Universe is small but by irregular configurations when large. He has argued that this behavior connects the thermodynamic arrow of time with the cosmological arrow. Here it is pointed out that although the total wave function may have the properties Hawking describes, an individual WKB component of it that is classically observable generically will not be CPT invariant and will not have its thermodynamic arrow of time reverse if it enters a recollapsing phase.

  • Received 19 July 1985

DOI:https://doi.org/10.1103/PhysRevD.32.2496

©1985 American Physical Society

Authors & Affiliations

Don N. Page

  • Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802

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Issue

Vol. 32, Iss. 10 — 15 November 1985

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