Holography, degenerate horizons and entropy
Abstract
We show that a realization of the correspondence AdS2/CFT1 for near extremal Reissner-Nordstrom black holes in arbitrary dimensional Einstein-Maxwell gravity exactly reproduces, via Cardy's formula, the deviation of the Bekenstein-Hawking entropy from extremality. We also show that this mechanism is valid for Schwarzschild-de Sitter black holes around the degenerate solution dS2xSn. These results reinforce the idea that the Bekenstein-Hawking entropy can be derived from symmetry principles.
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