Dynamics of supertubes

TL;DR

This paper studies the evolution of excitations on supertubes, revealing how their behavior changes with coupling strength and proposing methods to distinguish bound states from unbound states in black hole microstates.

Contribution

It introduces a mapping of supertube excitations to string waves and explores their evolution across different coupling regimes, linking to dual CFT phases and black hole microstate identification.

Findings

Excitations leak to infinity as coupling increases.

New long-lived excitations emerge at higher coupling.

Proposed criteria to distinguish bound from unbound states.

Abstract

We find the evolution of arbitrary excitations on 2-charge supertubes, by mapping the supertube to a string carrying traveling waves. We argue that when the coupling is increased from zero the energy of excitation leaks off to infinity, and when the coupling is increased still further a new set of long lived excitations emerge. We relate the excitations at small and large couplings to excitations in two different phases in the dual CFT. We conjecture a way to distinguish bound states from unbound states among 3-charge BPS geometries; this would identify black hole microstates among the complete set of BPS geometries.