Effects of Gauss-Bonnet gravity on thermodynamics of (3+1)$-D$ AdS black holes

TL;DR

This paper investigates how Gauss-Bonnet corrections influence the thermodynamics and phase transitions of charged AdS black holes, revealing second-order phase transition characteristics through thermodynamic analysis methods.

Contribution

It introduces the effects of Gauss-Bonnet terms on black hole entropy and phase transitions, specifically analyzing Reissner-Nordström and Born-Infeld black holes in 3+1 dimensions.

Findings

Gauss-Bonnet term modifies black hole entropy without affecting equations of motion.

Identified divergences in heat capacity indicating phase transition points.

Confirmed second-order phase transitions using Ehrenfest and Ruppeiner methods.

Abstract

We studied the thermodynamics of the black holes with Gauss-Bonnet correction term in $3+1-$ dimensional AdS spacetime. It is known that the term has no effect on the equation of motion, however, it modifies the entropy formula of Wald as it has an effect of the Gauss-Bonnet parameter term. We studied charged black holes, namely, Reissner-Nordstr\"{o}m and Born-Infeld under this regime. We encountered divergences in heat capacity. After eliminating the possibility of first order phase transition, we applied two well trusted methods from standard thermodynamics, namely, Ehrenfest scheme and Ruppeiner's state space geometry analysis to ensure the second order nature of phase transition points. Effects of Gauss-Bonnet and Born-Infeld parameter are also discussed.