Exponential corrections to black hole entropy

Abstract

Using the quasilocal properties alone we show that the area spectrum of a black hole horizon must be discrete, independent of any specific quantum theory of gravity. The area spectrum is found to be half-integer spaced with values $8\pi \gamma {\ell }_p^{2}j$ where $j\in \mathbb{N}/2$. We argue that if microstate counting is carried out for quantum states residing on the horizon only, correction of $\exp (-\mathcal{A}/4{\ell }_p^2)$ over the Bekenstein-Hawking area law must arise in black hole entropy.

6 pages, published in Phys. Rev. Lett

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