Conformal entropy from horizon states: Solodukhin's method for spherical, toroidal, and hyperbolic black holes in D-dimensional anti-de Sitter spacetimes

TL;DR

This paper calculates the entropy of various D-dimensional anti-de Sitter black holes using Solodukhin's conformal symmetry method, involving a dimensional reduction and Virasoro algebra analysis near the horizon.

Contribution

It applies Solodukhin's horizon conformal symmetry approach to compute black hole entropy in diverse topologies and dimensions within AdS spacetime, extending previous methods.

Findings

Entropy obtained via Cardy formula matches expected values.

Method applicable to spherical, toroidal, and hyperbolic horizons.

Provides a unified conformal symmetry framework for different black hole topologies.

Abstract

A calculation of the entropy of static, electrically charged, black holes with spherical, toroidal, and hyperbolic compact and oriented horizons, in D spacetime dimensions, is performed. These black holes live in an anti-de Sitter spacetime, i.e., a spacetime with negative cosmological constant. To find the entropy, the approach developed by Solodukhin is followed. The method consists in a redefinition of the variables in the metric, by considering the radial coordinate as a scalar field. Then one performs a 2+(D-2) dimensional reduction, where the (D-2) dimensions are in the angular coordinates, obtaining a 2-dimensional effective scalar field theory. This theory is a conformal theory in an infinitesimally small vicinity of the horizon. The corresponding conformal symmetry will then have conserved charges, associated with its infinitesimal conformal generators, which will generate a classical Poisson algebra of the Virasoro type. Shifting the charges and replacing Poisson brackets by commutators, one recovers the usual form of the Virasoro algebra, obtaining thus the level zero conserved charge eigenvalue L_0, and a nonzero central charge c. The entropy is then obtained via the Cardy formula.