Charged black holes in generalized dilaton-axion gravity

TL;DR

This paper derives new static, spherically symmetric black hole solutions in generalized dilaton-axion gravity, including asymptotically flat and non-flat cases with electric and magnetic charges, and analyzes their properties.

Contribution

It introduces a general framework for Einstein-Maxwell-Kalb-Ramond-dilaton actions and finds new black hole solutions with positive quasi-local mass.

Findings

New black hole solutions with finite mass

Solutions include asymptotically flat and non-flat cases

Recovery of known solutions in special limits

Abstract

We study generic Einstein-Maxwell-Kalb-Ramond-dilaton actions, and derive conditions under which they give rise to static, spherically symmetric black hole solutions. We obtain new asymptotically flat and non-flat black hole solutions which are in general electrically and magnetically charged. They have positive definite and finite quasi-local masses. Existing non-rotating black hole solutions (including those appearing in low energy string theory) are recovered in special limits.