Corrections to Bekenstein-Hawking Entropy — Quantum or not-so Quantum?

Publisher： MDPI

E-ISSN： 1099-4300|13|1|11-16

ISSN： 1099-4300

Source： Entropy, Vol.13, Iss.1, 2010-12, pp. : 11-16

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Abstract

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.