Symmetries, Horizons, and Black Hole Entropy

Details Symmetries, Horizons, and Black Hole Entropy Symmetries, Horizons, and Black Hole Entropy

2007-05-21

arxiv.org/abs/0705.3024v1

Gen.Rel.Grav.39:1519-1523,2007; Int.J.Mod.Phys.D17:659-664,2008

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

6 pages; first prize essay, 2007 Gravity Research Foundation essay contest

Scientific paper

10.1007/s10714-007-0467-6 10.114

Black holes behave as thermodynamic systems, and a central task of any quantum theory of gravity is to explain these thermal properties. A statistical mechanical description of black hole entropy once seemed remote, but today we suffer an embarrassment of riches: despite counting very different states, many inequivalent approaches to quantum gravity obtain identical results. Such ``universality'' may reflect an underlying two-dimensional conformal symmetry near the horizon, which can be powerful enough to control the thermal characteristics independent of other details of the theory. This picture suggests an elegant description of the relevant degrees of freedom as Goldstone-boson-like excitations arising from symmetry breaking by the conformal anomaly.

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