Thermodynamics of Born-Infeld-anti-de Sitter black holes in the grand canonical ensemble

TL;DR

This paper investigates the thermodynamics and phase structure of Born-Infeld-AdS black holes, revealing phase transitions, stability conditions, and a liquid-gas-solid analogy in their phase diagram.

Contribution

It provides a detailed analysis of thermodynamic stability and phase transitions of Born-Infeld-AdS black holes in the grand canonical ensemble, including new insights into their phase structure.

Findings

Hawking-Page phase transition occurs at small potentials.

Large potentials favor black hole dominance over thermal-AdS.

Extreme black holes are both globally and locally stable.

Abstract

The main objective of this paper is to study thermodynamics and stability of static electrically charged Born-Infeld black holes in AdS space in D=4. The Euclidean action for the grand canonical ensemble is computed with the appropriate boundary terms. The thermodynamical quantities such as the Gibbs free energy, entropy and specific heat of the black holes are derived from it. The global stability of black holes are studied in detail by studying the free energy for various potentials. For small values of the potential, we find that there is a Hawking-Page phase transition between a BIAdS black hole and the thermal-AdS space. For large potentials, the black hole phase is dominant and are preferred over the thermal-AdS space. Local stability is studied by computing the specific heat for constant potentials. The non-extreme black holes have two branches: small black holes are unstable and the large black holes are stable. The extreme black holes are shown to be stable both globally as well as locally. In addition to the thermodynamics, we also show that the phase structure relating the mass $M$ and the charge $Q$ of the black holes is similar to the liquid-gas-solid phase diagram.