Corrections to Bekenstein-Hawking entropy --- Quantum or not-so quantum?

Details Corrections to Bekenstein-Hawking entropy --- Quantum or not-so quantum? Corrections to Bekenstein-Hawking entropy --- Quantum or not-so quantum?

2010-12-30

arxiv.org/abs/1101.0030v1

Entropy 13(1), 11-16 (2011);

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

10 pages; Article for the Special Issue "Entropy in Quantum Gravity" in the Journal Entropy

Scientific paper

10.3390/e13010011

Hawking radiation and Bekenstein--Hawking entropy are the two robust predictions of a yet unknown quantum theory of gravity. Any theory which fails to reproduce these predictions is certainly incorrect. While several approaches lead to Bekenstein--Hawking entropy, they all lead to different sub-leading corrections. In this article, we ask a question that is relevant for any approach: Using simple techniques, can we know whether an approach contains quantum or semi-classical degrees of freedom? Using naive dimensional analysis, we show that the semi-classical black-hole entropy has the same dimensional dependence as the gravity action. Among others, this provides a plausible explanation for the connection between Einstein's equations and thermodynamic equation of state, and that the quantum corrections should have a different scaling behavior.

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