AdS 2 /CFT 1 correspondence and near-extremal black hole entropy Original Research Article

We provide a realization of the AdS 2 /CFT 1 correspondence in terms of asymptotic symmetries of the AdS 2× S 1 and AdS 2× S 2 geometries arising in near-extremal BTZ and Reissner–Nordström black holes. We evaluate the corresponding central charges and show that Cardyʹs formula exactly accounts for the deviation of the Bekenstein–Hawking entropy from extremality. We also argue that this result can be extended to more general black holes near extremality.