Anti-DeSitter Spaces and Nonextreme Black Holes

TL;DR

This paper explores the near horizon geometry of nonextreme black holes, revealing an effective conformal symmetry that accurately accounts for their entropy and compares different spectral proposals.

Contribution

It demonstrates the emergence of an SL(2,R)_L x SL(2,R)_R symmetry in the near horizon geometry and links it to black hole entropy calculations.

Findings

Effective conformal symmetry explains black hole entropy.

Spectrum comparison supports the proposed conformal field theory approach.

Near horizon geometry reveals SL(2,R) symmetries in nonextreme black holes.

Abstract

At low energy the near horizon geometry of nonextreme black holes in four dimensions exhibits an effective SL(2,R)_L x SL(2,R)_R symmetry. The parameters of the corresponding induced conformal field theory gives the correct expression for the black hole entropy. The resulting spectrum of the Schwarzchild black hole is compared with another proposal.