Maeda-Dadhich Solutions as Real Black Holes

TL;DR

This paper analyzes a four-dimensional black hole solution in Einstein-Gauss-Bonnet gravity, exploring its stability, horizon structure, particle orbits, and unusual thermodynamic behavior, with implications for observable astrophysical phenomena.

Contribution

It introduces a new class of black hole solutions in Einstein-Gauss-Bonnet gravity with detailed stability and thermodynamic analysis.

Findings

Solutions can have one or two horizons or naked singularities.

Black holes exhibit stable test particle orbits.

Thermodynamics shows inverse Hawking evaporation behavior.

Abstract

A four-dimensional static Schwarzschild-like solution obtained in [3]-[6] in the frames of the Einstein-Gauss-Bonnet gravity at the Kaluza-Klein split is analyzed. The matter in these solutions is created by auxiliary dimensions. The main goal of our work is to study physically sensible characteristics, which could be observable. Study of the perturbed equations demonstrates their stability under linear perturbations. The specific combinations of the parameters, permitting to construct black hole-like objects with one or two horizons or naked singularities are determined. Stable orbits of test particles around these black holes are presented. We show the exotic thermodynamical properties of the solution, when the Hawking evaporation law has the behavior opposite to usual one in General Relativity.