Ruppeiner geometry and thermodynamic phase transition of the black hole in massive gravity

TL;DR

This paper investigates the thermodynamic phase transitions and geometric properties of 4D AdS topological charged black holes in dRGT massive gravity, revealing how a key parameter influences black hole phases and interactions.

Contribution

It introduces a normalized thermodynamic scalar curvature and identifies a crucial parameter that characterizes the black hole's thermodynamic behavior, distinguishing it from other black hole models.

Findings

Existence of a key parameter linking topology, charge, and massive gravity parameters.

Positive parameter indicates no large black hole phase at low temperature and weak repulsion for small black holes.

Negative parameter introduces an additional large black hole phase with dominant repulsive interactions.

Abstract

The phase transition and thermodynamic geometry of a 4-dimensional AdS topological charged black hole in de Rham, Gabadadze and Tolley (dRGT) massive gravity have been studied. After introducing a normalized thermodynamic scalar curvature, it is speculated that its value is related to the interaction between the underlying black hole molecules if the black hole molecules exist. We show that there does exist a crucial parameter given in terms of the topology, charge, and massive parameters of the black hole, which characterizes the thermodynamic properties of the black hole. It is found that when the parameter is positive, the singlet large black hole phase does not exist for sufficient low temperature and there is a weak repulsive interaction dominating for the small black hole which is similar to the Reissner-Nordstr\"{o}m AdS black hole; when the parameter is negative, an additional phase region describing large black holes also implies a dominant repulsive interaction. These constitute the distinguishable features of dRGT massive topological black hole from those of the Reissner-Nordstr\"{o}m AdS black hole as well as the Van der Waals fluid system.