The double doors of the horizon

• URL: http://arxiv.org/abs/2206.11870v2
• Date: Wed, 10 Aug 2022 13:25:34 GMT
• Title: The double doors of the horizon
• Authors: Erik Aurell
• Abstract summary: In black hole thermodynamics one associates to a black hole an entropy Bekenstein-Hawking $S_BH$. I advance a hypothesis that the very large increase in entropy can perhaps be understood as an effect of classical gravity.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: In statistical mechanics entropy is a measure of disorder obeying Boltzmann's formula $S=\log{\cal N}$, where ${\cal N}$ is the accessible phase space volume. In black hole thermodynamics one associates to a black hole an entropy Bekenstein-Hawking $S_{BH}$. It is well known that $S_{BH}$ is very large for astrophysical black holes, much larger than any collection of material objects that could have given rise to the black hole. If $S_{BH}$ is an entropy the question is thus what is the corresponding ${\cal N}$, and how come this very large phase space volume is only opened up to the universe by a gravitational collapse, which from another perspective looks like a massive loss of possibilities. I advance a hypothesis that the very large increase in entropy can perhaps be understood as an effect of classical gravity, which eventually bottoms out when quantum gravity comes into play. I compare and discuss a selection of the very rich literature around these questions.

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