Instabilities of microstate geometries with antibranes

TL;DR

This paper demonstrates that certain microstate geometries representing near-extremal black holes are inherently unstable due to dynamic bubble movements, leading to decay processes analogous to Hawking radiation.

Contribution

It reveals a new class of instabilities in antibrane configurations within highly-warped flux regions, advancing understanding of black hole microstate stability.

Findings

Microstate geometries are unstable when bubble moduli are dynamic.

Decay processes resemble Hawking radiation emission.

Identifies a novel instability mechanism for antibranes in flux backgrounds.

Abstract

One can obtain very large classes of horizonless microstate geometries corresponding to near-extremal black holes by placing probe supertubes whose action has metastable minima inside certain supersymmetric bubbling solutions. We show that these minima can lower their energy when the bubbles move in certain directions in the moduli space, which implies that these near-extremal microstates are in fact unstable once one considers the dynamics of all their degrees of freedom. The decay of these solutions corresponds to Hawking radiation, and we compare the emission rate and frequency to those of the corresponding black hole. Our analysis supports the expectation that generic non-extremal black holes microstate geometries should be unstable. It also establishes the existence of a new type of instabilities for antibranes in highly-warped regions with charge dissolved in fluxes.