Cosmic R-string in thermal history

TL;DR

This paper investigates how thermal effects in a gauge mediation model can stabilize an otherwise unstable cosmic R-string associated with broken U(1)_R symmetry, preventing dangerous decay processes.

Contribution

It demonstrates that thermal plasma corrections can stabilize unstable cosmic strings in gauge mediation models, a novel mechanism for cosmic string stabilization.

Findings

Thermal plasma provides sufficient corrections to stabilize the string.

Unstable modes of the R-string can be effectively suppressed.

Stabilization prevents dangerous roll-over processes in the early universe.

Abstract

We study stabilization of an unstable cosmic string associated with spontaneously broken $U(1)_R$ symmetry, which otherwise causes a dangerous roll-over process. We demonstrate that in a gauge mediation model, messengers can receive enough corrections from the thermal plasma of the supersymmetric standard model particles to stabilize the unstable modes of the string.