2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/148040We examine string (vortex) formation at a quench for a weakly-coupled global U(1) theory when the excitation spectrum is non-relativistic. It is so similar to vortex production in the corresponding relativistic plasma as to reinforce arguments for the similarity of vorheptex production in the early universe and in low-temperature many-body physics.23 pages, replaced version - tex problems correctedHigh Energy Physics - Phenomenologytext