# Steve Carlip (UC Davis), BLACK HOLE ENTROPY FROM HORIZON CONSTRAINTS

Europe/London
Description
To describe black hole thermodynamics in any quantum theory of gravity, one must introduce constraints that ensure that a black hole is actually present. I show that for a very large class of dilaton black holes, the inclusion of such horizon constraints'' allows us to use conformal field theory techniques to compute the density of states, reproducing the correct Bekenstein-Hawking entropy in a nearly model-independent manner. This picture suggests an elegant description of the relevant degrees of freedom, as Goldstone-boson-like excitations arising from symmetry breaking by a conformal anomaly induced by the horizon constraints.
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