Alejandra Castro, Joshua M. Lapan, Alexander Maloney, Maria J. Rodriguez
The analytic structure of solutions to the Klein-Gordon equation in a black hole background, as represented by monodromy data, is intimately related to black hole thermodynamics. It encodes the "hidden conformal symmetry" of a non-extremal black hole, and it explains why features of the inner event horizon appear in scattering data such as greybody factors. This indicates that hidden conformal symmetry is generic within a universality class of black holes.
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http://arxiv.org/abs/1303.0759
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