Some Aspects of Four Dimensional Black Hole Solutions in Gauss-Bonnet Extended String Gravity

TL;DR

This paper investigates four-dimensional black holes in Gauss-Bonnet extended string gravity, revealing a minimal size restriction and analyzing the effects of vacuum polarization around such black holes.

Contribution

It introduces a minimal size constraint for neutral black holes in Gauss-Bonnet string gravity and discusses the associated vacuum polarization effects.

Findings

Identification of a minimal black hole size due to curvature corrections

Analysis of vacuum polarization effects around minimal black holes

Discussion of internal singularities in the model

Abstract

An internal singularity of a string four-dimensional black hole with second order curvature corrections is discussed. A restriction to a minimal size of a neutral black hole is obtained in the frame of the model considered. Vacuum polarization of the surrounding space-time caused by this minimal-size black hole is also discussed.