Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-08-14
Prog.Theor.Phys. 100 (1998) 535-545
Physics
High Energy Physics
High Energy Physics - Phenomenology
17 pages, uuencode, gzipped tar file including LaTeX text and 7 postscript figures. Some statements are changed
Scientific paper
10.1143/PTP.100.535
We simulate the formation and the evolution of global strings taking into account the expansion of the universe and the concomitant change of the effective potential, that is, the change from the restoration stage of the global {\it U}(1)-symmetry to the broken stage. Starting from the thermal equilibrium state, we run simulations for 100 sets of different initial conditions in 2+1 dimensions. As a result, we find deviation from scale invariance. This is because the energy loss mechanism is pair annihilation rather than intercommutation, so that a string and an anti-string attract each other under a logarithmic potential.
Kawasaki Masahiro
Yamaguchi Masahide
Yokoyama Jun'ichi
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