Thermodynamic stability of a new three dimensional regular black hole

TL;DR

This paper introduces a new three-dimensional regular black hole model with bounded horizon radius and mass, analyzing its geometric properties and demonstrating its thermal stability within a specific parameter domain.

Contribution

It presents a novel regular black hole model in (2+1) dimensions with bounds on horizon radius and mass, and studies its geometric and thermodynamic stability.

Findings

Existence of upper bound on event horizon radius

Lower bound on black hole mass

Thermal stability within the admissible domain

Abstract

A new model of the regular black hole in $(2+1)-$dimensions is introduced by considering an appropriate matter field as the energy-momentum tensor. First, we propose a novel model of $d$-dimensional energy density that in $(2+1)-$dimensions leads to the existence of an upper bound on the radius of the event horizon and a lower bound on the mass of the black hole which are motivated by the features of astrophysical black holes. According to these bounds, we introduce an admissible domain for the event horizon radius, depending on the metric parameters. After investigation of geometric properties of the obtained solutions, we study the thermal stability of the solution in the canonical ensemble and find that the regular black hole is thermally stable in the mentioned admissible domain. Besides, the Gibbs free energy is calculated to examine the global stability of the solution.