Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1995-07-18
Phys.Rev.D53:575-579,1996
Physics
High Energy Physics
High Energy Physics - Phenomenology
8 pages, uuencoded gziped .ps file. Paper submitted to Phys. Rev. Lett
Scientific paper
10.1103/PhysRevD.53.575
We study the effects of friction on the scaling evolution of string networks in condensed matter and cosmological contexts. We derive a generalized `one-scale' model with the string correlation length $L$ and velocity $v$ as dynamical variables. In non-relativistic systems, we obtain a well-known $L\propto t^{1/2}$ law, showing that loop production is important. For electroweak cosmic strings, we show transient damped epoch scaling with $L\propto t^{5/4}$ (or, in the matter era, $L\propto t^{3/2}$). A low initial density implies an earlier period with $L\propto t^{1/2}$. For GUT strings, the approach to linear scaling $L\propto t$ is faster than previously estimated.
Martins Carlos J. A. P.
Shellard Paul. E. S.
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