Black Hole Entropy and the Problem of Universality

Details Black Hole Entropy and the Problem of Universality Black Hole Entropy and the Problem of Universality

2007-02-16

arxiv.org/abs/gr-qc/0702094v1

J.Phys.Conf.Ser.67:012022,2007

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

10 pages, LaTeX; talk at DICE 2006, Piombino, Italy

Scientific paper

10.1088/1742-6596/67/1/012022

A key test of any quantum theory of gravity is its ability to reproduce the known thermodynamic properties of black holes. A statistical mechanical description of the Bekenstein-Hawking entropy once seemed remote, but today we suffer an embarrassment of riches: many different approaches to quantum gravity yield the same entropy, despite counting very different states. This ``universality'' suggests that some underlying feature of the classical theory may control the quantum density of states. I discuss the possibility that this feature is an approximate two-dimensional conformal symmetry near the horizon.

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