Effective convergence of the two-particle irreducible 1 / N expansion for nonequilibrium quantum fields
Effective convergence of the two-particle irreducible 1 / N expansion for nonequilibrium quantum fields
复制标题
非平衡量子场双粒子不可约1/N展开的有效收敛
DOI：
10.1103/physrevd.78.125028
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发表时间：
2008
影响因子：
5
通讯作者：
Aarts G
中科院分区：
文献类型：
--
作者：
Aarts G
二粒子不可约有效作用的扩展为研究远离平衡态的量子场动力学提供了一个强有力的方法。通过比较在领先阶、次领先阶和次领先阶以及弱耦合极限下的数值维数结果，研究了该模型展开的有效收敛性。在经典统计场论中也作了比较，其中有精确的数值结果。我们关注早期动力学和远离平衡态的准粒子性质，并观察到中等耦合值的快速有效收敛。
Theexpansion of the two-particle irreducible effective action offers a powerful approach to study quantum field dynamics far from equilibrium. We investigate the effective convergence of theexpansion in themodel by comparing results obtained numerically indimensions at leading, next-to-leading and next-to-next-to-leading order inas well as in the weak coupling limit. A comparison in classical statistical field theory, where exact numerical results are available, is made as well. We focus on early-time dynamics and quasiparticle properties far from equilibrium and observe rapid effective convergence already for moderate values ofor the coupling.