Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2006-05-08
Phys.Rev.D74:121701,2006
Physics
High Energy Physics
High Energy Physics - Theory
5 pages, 4 figures. data points added, plots for deep type II regime showing lower critical velocities, some minor changes in
Scientific paper
10.1103/PhysRevD.74.121701
We present evidence that Abrikosov-Nielsen-Olesen (ANO) strings pass through each other for very high speeds of approach due to a double intercommutation. In near-perpendicular collisions numerical simulations give threshold speeds bounded above by $\sim 0.97 c$ for type I, and by $\sim 0.90 c$ for deep type II strings. The second intercommutation occurs because at ultra high collision speeds, the connecting segments formed by the first intercommutation are nearly static and almost antiparallel, which gives them time to interact and annihilate. A simple model explains the rough features of the threshold velocity dependence with the incidence angle. For deep type II strings and large incidence angles a second effect becomes dominant, the formation of a loop that catches up with the interpolating segments. The loop is related to the observed vortex - antivortex reemergence in two-dimensions. In this case the critical value for double intercommutation can become much lower.
Achucarro Ana
de Putter Roland
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