Electrically charged dilaton black holes in external magnetic field

TL;DR

This paper constructs a novel solution for electrically charged dilaton black holes in a strong external magnetic field, revealing their unique properties such as rotation without angular momentum and localized ergoregions, while showing magnetic fields do not alter thermodynamics.

Contribution

It introduces a new exact solution for charged dilaton black holes in magnetic fields, highlighting their rotation, ergoregions, and thermodynamic invariance.

Findings

Black holes are rotating with zero total angular momentum.

Ergoregions are confined near the horizon.

Magnetic field does not affect thermodynamic properties.

Abstract

In the present paper we construct a new solution to the Einstein-Maxwell-dilaton gravity equations describing electrically charged dilaton black holes immersed in a strong external magnetic field and we study its properties. The black holes described by the solution are rotating but with zero total angular momentum and possess an ergoregion confined in a neighborhood of the horizon. Our results also show that the external magnetic field does not affect the black hole thermodynamics.