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

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 Cardy's 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.