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 vortex production in the early universe and in
low-temperature many-body physics.Comment: 20 pages, RevTeX and epsf, 1 postscript figure. Resubmitted because
archive (not a bulletin board) ate the figures file first time round.
Available through anonymous ftp as LaTeX from
ftp://euclid.tp.ph.ic.ac.uk/papers/94-5_53.tex or as LaTeX or postscript at
http://euclid.tp.ph.ic.ac.uk/Papers/index.htm
