Entropy 2005, 7[4], 199-207
ISSN 1099-4300

Letter to the Editor
Remarks on the Compatibility of Opposite Arrows of Time

H.D. Zeh

Universität Heidelberg
Gaiberger Str. 38, D69151 Waldhilsbach, Germany
URL: http://www.zeh-hd.de
E-mail: zeh@urz.uni-heidelberg.de

Received: 15 August 2005 / Accepted: 20 September 2005 / Published: 23 September 2005

Abstract: I argue that opposite arrows of time, while being logically possible, cannot realistically be assumed to exist during one and the same epoch of our universe.

Keywords: time arrow; final conditions; solvable models; causality; retardation; cosmology; big crunch; black holes; quantum measurements; Wheeler-DeWitt equation.

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