Exact Black String Solutions in Three Dimensions

TL;DR

This paper constructs exact three-dimensional black string solutions in string theory with unique features like a regular inner horizon and a disappearing singularity at high charge, expanding understanding of black objects in lower dimensions.

Contribution

It introduces a new family of exact conformal field theory solutions describing charged black strings with novel horizon and singularity properties in three dimensions.

Findings

The solutions have a regular inner horizon.

The singularity disappears as charge approaches mass.

The solutions differ from previous black hole models in string theory.

Abstract

A family of exact conformal field theories is constructed which describe charged black strings in three dimensions. Unlike previous charged black hole or extended black hole solutions in string theory, the low energy spacetime metric has a regular inner horizon (in addition to the event horizon) and a timelike singularity. As the charge to mass ratio approaches unity, the event horizon remains but the singularity disappears.