Near Extremal Kerr Entropy from AdS_2 Quantum Gravity

Understand

We analyze the asymptotic symmetries of near extremal Kerr black holes in four dimensions using the AdS_2/CFT_1 correspondence.

• We find a Virasoro algebra with central charge c_R=12J that is independent from the Virasoro algebra (with the same central charge) that acts on the degenerate ground state.
• The energy of the excitations is computed as well, and we can use Cardy's formula to determine the near extremal entropy.
• Our result is consistent with the Bekenstein-Hawking area law for near extremal Kerr black holes.