A new accidental symmetry of the NHEK near-horizon geometry maps extreme to near-extreme Kerr perturbations and embeds with SL(2,R) into a Virasoro algebra.
New Near Horizon Limit in Kerr/CFT
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The extremal Kerr black hole with the angular momentum J is conjectured to be dual to CFT with central charges c_L=c_R=12J. However, the central charge in the right sector remains to be explicitly derived so far. In order to investigate this issue, we introduce new near horizon limits of (near) extremal Kerr and five-dimensional Myers-Perry black holes. We obtain Virasoro algebras as asymptotic symmetries and calculate the central charges associated with them. One of them is equivalent to that of the previous studies, and the other is non-zero, but still the order of near extremal parameter. Redefining the algebras to take the standard form, we obtain a finite value as expected by the Kerr/CFT correspondence.
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Accidental Symmetry Near Extreme Spinning Black Holes
A new accidental symmetry of the NHEK near-horizon geometry maps extreme to near-extreme Kerr perturbations and embeds with SL(2,R) into a Virasoro algebra.