Cosmic R-string in thermal history

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.

Comments: 28 pages, 11 figures, v2: references added