Overpopulated gauge fields on the lattice

被引：49
作者：
Berges, Juergen [1 ]
Schlichting, Soeren [1 ]
Sexty, Denes [1 ]
机构：
[1] Heidelberg Univ, Inst Theoret Kernphys, D-69120 Heidelberg, Germany
来源：
PHYSICAL REVIEW D | 2012年 / 86卷 / 07期
关键词：
QUARK-GLUON PLASMA; COLLISIONS; THERMALIZATION; PERSPECTIVE; TURBULENCE;
D O I：
10.1103/PhysRevD.86.074006
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We study nonequilibrium dynamics of SU(2) pure gauge theory starting from initial overpopulation, where intense classical gauge fields are characterized by a single momentum scale Q(s). Classical-statistical lattice simulations indicate a quick evolution towards an approximate scaling behavior with exponent 3/2 at intermediate times. Remarkably, the value for the scaling exponent may be understood as arising from the leading O(g(2)) contribution in the presence of a time-dependent background field. The phenomenon is associated to weak wave turbulence describing an energy cascade towards higher momenta. This particular aspect is very similar to what is observed for scalar theories, where an effective cubic interaction arises because of the presence of a time-dependent Bose condensate.
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