Ee Chang-Young, Myungseok Eune
We study the conformal symmetry described by $SL(2,R)_L \times SL(2,R)_R$ in the nonextremal Kerr black hole case. We calculate the central charges $c_{L,R}$ separately on a stretched horizon by the Hamiltonian gravity. In order to get two sets of conformal symmetry, we consider two Killing vectors each of which lives on one of the two independent coordinates separated from the angular coordinate of the corotating frame at the horizon. This was done in the spirit of point-splitting but with asymmetric separations. Then with appropriate choice of parameters, we obtain the Bekenstein-Hawking entropy by the Cardy formula.
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http://arxiv.org/abs/1212.3031
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