Black Holes in the Framework of the Four-Dimensional Effective Theory of Heterotic Superstrings at Low Energies

TL;DR

This paper explores new black hole solutions within the four-dimensional effective heterotic superstring theory, demonstrating evasion of no-hair theorems, analyzing properties of Dilatonic and Coloured black holes, and examining their stability.

Contribution

It introduces novel black hole solutions in heterotic string theory, including Dilatonic and Coloured black holes, and studies their properties and stability.

Findings

Analytical scalar field expressions in Kerr-Newman background

Evasion of no-hair theorems with higher curvature terms

Linear stability of Dilatonic black holes

Abstract

In the framework of the four-dimensional effective theory of heterotic superstrings at low energies, which is considered as a generalised theory of gravity, we search for new black hole solutions. The analytical expressions of all the scalar fields of the effective theory is determined in a Kerr-Newman black hole background and the evasion of the existing "no-hair" theorems in the presence of higher curvature gravitational terms is demonstrated. New black hole solutions, such as the Dilatonic and the Coloured black holes, are determined by use of numerical integration and their properties are analysed. Finally, the linear stability of Dilatonic black holes under small time-dependent perturbations is exhibited through a semi-analytic method.