Black Hole Entropy and Gravity Cutoff

Abstract

We study the black hole entropy as entanglement entropy and propose a resolution to the species puzzle. This resolution comes out naturally due to the fact that in the presence of $N$ species the universal gravitational cutoff is $\Lambda =M_{\mathrm{Planck}}/\sqrt{N}$, as opposed to $M_{\mathrm{Planck}}$. We demonstrate consistency of our solution by showing the equality of the two entropies in explicit examples in which the relation between $M_{\mathrm{Planck}}$ and $\Lambda$ is known from the fundamental theory.

11 pages, no figures

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