Hidden conformal symmetry of warped AdS3 black holes

We show that for a certain low frequency limit, the wave equation of a generic massive scalar field in the background of the spacelike warped AdS3 black hole can be written as the Casimir of an SL(2,R) symmetry. Two sets of SL(2,R) generators are found which uncover the hidden SL(2,R)×SL(2,R) symmetry of the solution. This symmetry is only defined locally and is spontaneously broken to U(1)×U(1) by a periodic identification of the ϕ coordinate. By using the generator of the identification we read the left and right temperatures (TL,TR) of the proposed dual conformal field theory which are in complete agreement with the WAdS/CFT conjecture. Moreover, under the above condition of the scalar wave frequency, the absorption cross section of the scalar field is consistent with the two-point function of the dual CFT.