Towards far-from-equilibrium quantum field dynamics: A functional renormalisation-group approach

被引：61

作者：

Gasenzer, Thomas ^{[1
]}

Pawlowski, Jan M. ^{[1
]}

机构：

[1] Heidelberg Univ, Inst Theoret Phys, D-69120 Heidelberg, Germany

来源：

PHYSICS LETTERS B | 2008年 / 670卷 / 02期

关键词：

D O I：

10.1016/j.physletb.2008.10.049

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Dynamic equations for quantum fields far from equilibrium are derived by use of functional renormalisation group techniques. The obtained equations are non-perturbative and lead substantially beyond mean-field and quantum Boltzmann type approximations. The approach is based on a regularised version of the generating functional for correlation functions where times greater than a chosen cutoff time are suppressed. As a central result, a time evolution equation for the non-equilibrium effective action is derived, and the time evolution of the Green functions is computed within a vertex expansion. It is shown that this agrees with the dynamics derived from the 1/N-expansion of the two-particle irreducible effective action. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：135 / 140

页数：6

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