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CFT's on the boundaries of AdS3
Klaus Behrndt, Ilka Bruhner, Ingo Gaida
We present an analysis of AdS_3 gravity and the associated conformal field theories (CFTs). In particular we describe a BTZ black hole not as an excitation of the AdS_3 vacuum but by a spatial annulus geometry, where the bulk is fixed by different CFTs living on the two boundaries: a Liouville model at the outer boundary and a 2-d black hole at the inner boundary. These CFTs provide the dynamical degrees of freedom of the 3-d model. We test the proposed black hole entropy by an independent field theoretical analysis including higher-order curvature corrections and find consistent results.
hep-th/9806195

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