Effective Conformal Descriptions of Black Hole Entropy: A Review

Abstract

Black holes behave as thermodynamic objects, and it is natural to ask for an underlying "statistical mechanical" explanation in terms of microscopic degrees of freedom. I summarize attempts to describe these degrees of freedom in terms of a dual two-dimensional conformal field theory, emphasizing the generality of the Cardy formula and the consequent universal nature of the conformal description.

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