Winding tachyons in asymptotically supersymmetric black strings

TL;DR

This paper demonstrates that in certain supersymmetric black string backgrounds, localized tachyonic modes can exist inside the spacetime, and their condensation leads to specific microstate solutions.

Contribution

It reveals the presence of localized tachyons in supersymmetric black strings and proposes their condensation results in known microstate geometries.

Findings

Localized tachyons can exist inside supersymmetric black strings.

Tachyon condensation leads to microstate solitonic solutions.

Tachyonic regions can extend outside the event horizon.

Abstract

We show that in the D1-D5 system with angular momentum, there can be localised tachyonic winding string modes in the interior of the spacetime even if we choose a spin structure which preserves supersymmetry in the asymptotic region. We consider cases where the tachyonic region extends outside the event horizon, and argue that the natural endstate of tachyon condensation in almost all cases is one of the solitonic solutions which correspond to special microstates of the D1-D5 system.