Scale-invariant string evolution with friction.
Scale-invariant string evolution with friction.
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具有摩擦的尺度不变弦演化。
DOI:
10.1103/physrevd.53.r575
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发表时间:
1996
期刊:
影响因子:
--
通讯作者:
Shellard
中科院分区:
文献类型:
--
作者:
Martins;Shellard
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 nonrelativistic systems, we obtain a well-known L∝ t 1/2 law, showing that loop production is important. For electroweak cosmic strings, we show transient damped epoch scaling with L∝ t 5/4 (or, in the matter era, L∝ t 3/2). A low initial density implies an earlier period with L∝ t 1/2. For GUT strings, the approach to linear scaling L∝ t is faster than previously estimated.© 1996 The American Physical Society.