Nonlinear dynamics of cosmic strings with nonscaling loops

作者：Vanchurin Vitaly^*

来源：Physical Review D - Particles, Fields, Gravitation and Cosmology, 2010, 82(6): 063503.

DOI：10.1103/PhysRevD.82.063503

At early stages the dynamics of cosmic string networks is expected to be influenced by an excessive production of small loops at the scales of initial conditions l(min). To understand the late time behavior we propose a very simple analytical model of strings with a nonscaling population of loops. The complicated nonlinear dynamics is described by only a single parameter N similar to 2/(1 - C(l(min))) where C(l) is a correlation function of the string tangent vectors. The model predicts an appearance of two new length scales: the coherence length xi similar to t/N(2) and the cross-correlation length chi similar to t/N. At the onset of evolution N similar to 10 and at late times N is expected to grow logarithmically due to cosmological stretching and emission of small loops. The very late time evolution might be modified further when the gravitational back-reaction scale grows larger than l(min).

• 出版日期2010-9-1