Vortex Production at Phase Transitions in Nonrelativistic and Relativistic Media

Abstract

We 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.

Comments: 23 pages, replaced version - tex problems corrected