Hidden conformal symmetry of extremal Kaluza-Klein black hole in four dimensions

Understand

We study the hidden conformal symmetry of four-dimensional extremal Kaluza-Klein black hole.

• The scalar Laplacian corresponding to the radial equation in the near-region is rewritten in terms of the $SL(2,\mathbb R)$ quadratic Casimir.
• Using the first law of black hole thermodynamics, this symmetry enables us to obtain the conjugate charges for the CFT side.
• The real-time correlators are also found to agree with the CFT expectations.