We show that there exists a holographic 2D CFT description of a
Kerr-Bolt-AdS-dS spacetime. We first consider the wave equation of a massless
scalar field propagating in extremal Kerr-Bolt-AdS-dS spacetimes and find in
the "near region", the wave equation in extremal limit could be written in
terms of the SL(2,R) quadratic Casimir. This suggests that there exist dual
CFT descriptions of these black holes. In the probe limit, we compute the
scattering amplitudes of the scalar off the extremal black holes and find
perfect agreement with the CFT prediction. Furthermore we study the holographic
description of the generic four dimensional non-extremal Kerr-Bolt-AdS-dS black
holes. We find that if focusing on the near-horizon region, for the massless
scalar scattering in the low-frequency limit, the radial equation could still
be rewritten as the SL(2,R) quadratic Casimir, suggesting the existence of
dual 2D description. We read the temperatures of the dual CFT from the
conformal coordinates and obtain the central charges by studying the
near-horizon geometry of near-extremal black holes. We recover the macroscopic
entropy from the microscopic counting. We also show that for the superradiant
scattering, the retarded Green's functions and the corresponding absorption
cross sections are in perfect match with CFT prediction.Comment: 17 pages, typos corrected, references adde
