Hidden Conformal Symmetry of Extremal Black Holes

Abstract

We study the hidden conformal symmetry of the extremal black holes. We introduce a new set of conformal coordinates to write the $SL(2,R)$ generators. We find that the Laplacian of the scalar field in many extremal black holes could be written in terms of the $SL(2,R)$ quadratic Casimir. This suggests that there exist dual CFT descriptions of these black holes. From the conformal coordinates, the temperatures of the dual CFTs could be read directly. For the extremal black hole, the Hawking temperature is vanishing. Correspondingly, only the left (right) temperature of the dual CFT is non-vanishing and the excitations of the other sector are suppressed. 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.

16 pages; Published version

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• Hidden Conformal Symmetry of Rotating Black Hole with four Charges
• Hidden Conformal Symmetry of Extremal Kerr-Bolt Spacetimes
• New Near Horizon Limit in Kerr/CFT
• Quasi-normal Modes of Extremal Black Holes from Hidden Conformal Symmetry
• Scaling dimensions in hidden Kerr/CFT