A Thermodynamic Study of $\textbf{(2+1)}$-Dimensional Analytic Charged Hairy Black Holes with Born-Infeld Electrodynamics

TL;DR

This paper derives analytical solutions for charged hairy black holes in (2+1)-dimensional AdS spacetime within Einstein-Born-Infeld-Scalar gravity, analyzing their thermodynamics and phase transitions.

Contribution

It provides new exact black hole solutions with scalar hair and Born-Infeld electrodynamics, and explores their thermodynamic stability and phase transition behavior.

Findings

One solution is thermodynamically stable at all temperatures.

The other solution exhibits a Hawking/Page phase transition.

Scalar hair and charge parameters influence the phase transition conditions.

Abstract

This work presents analytical black hole solutions for a coupled Einstein-Born-Infeld-Scalar gravity system in AdS spacetime with two different non-minimal coupling functions $f(z)$. For both solutions, we establish the regularity of the scalar field and curvature scalars outside the horizon. For one of the considered coupling cases, thermodynamic analysis in the canonical ensemble reveals stability across all temperatures, while the other case exhibits the Hawking/Page phase transition between the stable large phase of the black hole and thermal-AdS. We investigate the effect of the scalar hair parameter and black hole charge on the phase transition temperature and observe that the critical values of the scalar hair and the charge parameters constrain the feasibility of Hawking/Page phase transition.