Renormalized nonequilibrium quantum field theory: Scalar fields
Renormalized nonequilibrium quantum field theory: Scalar fields
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重整化非平衡量子场论：标量场
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
Ecole Polytechnique Cnrs
中科院分区：
文献类型：
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作者：
S. Borsányi;Urko Reinosa University of Sussex;Kitp Santa Barbara;Ecole Polytechnique Cnrs
利用二粒子不可约（2PI）有效作用量理论讨论了量子场论中初值问题的重整化。非平衡态动力学由平衡态中确定的反项重整化。我们强调适当选择初始条件的重要性，并通过定义自洽初始条件超越高斯初始密度算子。我们研究了相应的时间演化，并给出了一个数值例子，支持这种类型的初始条件的连续极限的存在。
We discuss the renormalization of the initial value problem in quantum field theory using the two-particle irreducible (2PI) effective action formalism. The nonequilibrium dynamics is renormalized by counterterms determined in equilibrium. We emphasize the importance of the appropriate choice of initial conditions and go beyond the Gaussian initial density operator by defining self-consistent initial conditions. We study the corresponding time evolution and present a numerical example which supports the existence of a continuum limit for this type of initial conditions.