Non-asymptotically flat, non-dS/AdS dyonic black holes in dilaton gravity

TL;DR

This paper introduces exact dyonic black hole solutions in four-dimensional Einstein-Maxwell-dilaton gravity with unique asymptotics, expanding understanding of black hole configurations beyond traditional asymptotic behaviors.

Contribution

The paper provides new exact solutions for dyonic black holes with unusual asymptotics in Einstein-Maxwell-dilaton gravity, including topological variants.

Findings

Solutions have one or two horizons.

Solutions exhibit non-standard asymptotics.

Black holes possess a curvature singularity at the origin.

Abstract

We present exact spherically symmetric dyonic black hole solutions in four-dimensional Einstein-Maxwell-dilaton gravity with Liouville-type potentials for the dilaton field. These solutions have unusual asymptotics--they are neither asymptotically flat nor asymptotically (anti-) de Sitter. The solutions have one or two horizons hiding a curvature singularity at the origin. A class of topological dyonic black holes with topology of a torus is also presented. Some basic properties of the black holes are discussed.