Emergent AdS 3 in the zero entropy extremal black holes
We investigate the zero entropy limit of the near horizon geometries of D = 4 and D = 5 general extremal black holes with symmetry. We derive some conditions on the geometries from expectation of regularity. We then show that an AdS3 structure emerges in a certain scaling limit, though the periodicity shrinks to zero. We present some examples to see the
above concretely. We also comment on some implications to the Kerr/CFT correspondence.