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Where Was Past Low-Entropy?

Centre de Physique Théorique (CPT), Aix-Marseille Université, Université de Toulon, CNRS, F-13288 Marseille, France
Entropy 2019, 21(5), 466; https://doi.org/10.3390/e21050466
Received: 17 March 2019 / Revised: 24 April 2019 / Accepted: 2 May 2019 / Published: 4 May 2019
(This article belongs to the Special Issue Entropy Production and Its Applications: From Cosmology to Biology)
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Abstract

Where was the past low-entropy of the early universe located? Contrary to some popular answers, I argue that that the dominant source of low-entropy is the fact that a single degree of freedom, the scale factor, was not at equilibrium. I also discuss possible interpretations of the “improbability” of this early low-entropy. View Full-Text
Keywords: arrow of time; entropy in cosmology; past hypothesis arrow of time; entropy in cosmology; past hypothesis
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Rovelli, C. Where Was Past Low-Entropy? Entropy 2019, 21, 466.

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