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Open AccessArticle

The Subtle Unphysical Hypothesis of the Firewall Theorem

Centre de Physique Théorique, Aix-Marseille Université, Université de Toulon, CNRS, F-13288 Marseille, France
Entropy 2019, 21(9), 839; https://doi.org/10.3390/e21090839
Received: 12 August 2019 / Revised: 23 August 2019 / Accepted: 24 August 2019 / Published: 27 August 2019
(This article belongs to the Special Issue The Ubiquity of Entropy)
The black-hole firewall theorem derives a suspicious consequence (large energy-momentum density at the horizon of a black hole) from a set of seemingly reasonable hypotheses. I point out the hypothesis that is likely to be unrealistic (a hypothesis not always sufficiently made explicit) and discuss the subtle confusion at its origin: mixing-up of two different notions of entropy and misusing the entropy bound. View Full-Text
Keywords: black hole entropy; information paradox; entropy black hole entropy; information paradox; entropy
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Rovelli, C. The Subtle Unphysical Hypothesis of the Firewall Theorem. Entropy 2019, 21, 839.

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