Statistical mechanics of the three-dimensional Euclidean black hole

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Abstract
In its formulation as a Chern-Simons theory, three-dimensional general relativity induces a Wess-Zumino-Witten (WZW) action on spatial boundaries. Treating the horizon of the three-dimensional Euclidean black hole as a boundary, I count the states of the resulting WZW model, and show that when analytically continued back to Lorentzian signature, they yield the correct Bekenstein-Hawking entropy. The relevant states can be understood as “would-be gauge” degrees of freedom that become dynamical at the horizon.