Stable Black Strings from Warped Backgrounds

TL;DR

This paper demonstrates that spacetime curvature can stabilize black strings in five-dimensional dilaton-gravity models, revealing conditions under which they remain classically stable, including in curved backgrounds with infinite horizon area.

Contribution

It introduces a new mechanism for black string stability based solely on spacetime curvature in a consistent five-dimensional framework.

Findings

Black strings are stable when extending from the brane to a boundary.

Stability occurs in the linear dilaton spacetime and certain curved backgrounds.

Some stable black strings have infinite horizon area.

Abstract

We show that spacetime curvature alone can classically stabilize black strings. Working within a consistent five-dimensional dilaton-gravity system with a flat brane, we find that sufficiently large black strings are classically stable when they extend from the brane to a timelike boundary, which may be either regular or conformal. Black strings are also classically stable in the critical case of the linear dilaton spacetime. In some of the curved backgrounds considered, black strings are stable despite having infinite horizon area.