On the General Kerr/CFT Correspondence in Arbitrary Dimensions
  We study conformal symmetries on the horizon of a general stationary and axisymmetric black hole. We find that there exist physically reasonable boundary conditions that uniquely determine a set of symmetry generators, which form one copy of the Virasoro algebra. For extremal black holes, Cardy's formula reproduces exactly the Bekenstein-Hawking entropy. 
Jianwei Mei
hep-th gr-qc