Topological dyonic dilaton black holes in AdS spaces

TL;DR

This paper introduces a new class of dyonic dilaton black hole solutions in AdS space, analyzing their properties, thermodynamics, and stability, with a focus on the string case where the dilaton coupling is unity.

Contribution

The paper presents an analytical solution for dyonic dilaton black holes in AdS space with string coupling, including thermodynamic and stability analysis.

Findings

Solutions can describe black holes with various horizon structures.

Thermodynamics satisfies the first law and includes stability conditions.

Asymptotic behavior matches AdS spacetime with zero dilaton field.

Abstract

We construct a new class of dyonic dilaton black hole solutions in the background of Anti-de Sitter (AdS) spacetime. In order to find an analytical solution which satisfy all the field equations, we should consider the string case where the dilaton coupling is $\alpha=1$. The asymptotic behaviour of the solution ($r\rightarrow\infty$) is exactly AdS, where the dilaton field becomes zero and the metric function reduces to $f(r)\rightarrow -\Lambda r^2/3$. In this spacetime, black hole horizons and cosmological horizons, can be a two-dimensional positive, zero or negative constant curvature surface. We study the physical properties of the solution and show that depending on the metric parameters, these solutions can describe black holes with one or two horizons or a naked singularity. We investigate thermodynamics of the solutions by calculating the charge, mass, temperature, entropy and the electric potential of these solutions and disclose that these conserved and thermodynamic quantities satisfy the first law of black hole thermodynamics. We also analyze thermal stability of the solutions and find the conditions for which we have a stable dyonic dilaton black hole.