A. M. Ghezelbash, H. M. Siahaan
It is recently conjectured that generic non-extreme Kerr black hole could be holographically dual to a hidden conformal field theory in two dimensions. The hidden conformal structure can be revealed by looking at charged scalar wave equation in some appropriate values of frequency and charge. In this regard, we consider the wave equation of a charged massless scalar field in background of Kerr-Sen black hole and show in the "near region", the wave equation can be reproduced by the Casimir operator of a local $SL(2,R)_L \times SL(2,R)_R$ hidden conformal symmetry. We then find exact agreement between macroscopic and microscopic physical quantities like entropy and absorption cross section of scalars for Kerr-Sen black hole. We then find an extension of vector fields that in turn yields an extended local family of $SL(2,R)_L \times SL(2,R)_R$ hidden conformal symmetries, parametrized by one parameter. For some special values of the parameter, we find a copy of $SL(2,R)$ hidden conformal algebra for the charged Gibbons-Maeda-Garfinkle-Horowitz-Strominger black hole in the strong deflection limit.
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http://arxiv.org/abs/1206.0714
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