2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/216115We consider the phase transition of a string with tension $\eps_1$ to a string with a smaller tension $\eps_2$ at finite temperature. For sufficiently small temperatures the transition proceeds through thermally catalyzed quantum tunneling, and we calculate in arbitrary number of dimensions the thermal catalysis factor. At $\eps_2=0$ the found formula for the decay rate also describes a break up of a metastable string into two pieces.15 pages, 5 figuresHigh Energy Physics - Theorytext