Far-from-equilibrium dynamics with broken symmetries from the 1/N expansion of the 2PI effective action

Far-from-equilibrium dynamics with broken symmetries from the 1/N expansion of the 2PI effective action
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2PI 有效作用的 1/N 展开导致对称性破缺的远离平衡动力学

DOI:
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发表时间:
2002
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通讯作者:
J. Serreau
J. Serreau
中科院分区:
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文献类型:
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作者:
G. Aarts;D. Ahrensmeier;R. Baier;J. Berges;J. Serreau

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在非零期望值存在的情况下,我们导出了O(N)不变标量量子场论的非平衡实时演化。利用系统的1/N展开的2 PI有效作用量的次主导阶,我们得到的非微扰发展方程,其中包括散射和记忆效应。等价的直接方法,它需要remation的无限数量的骨架图,与非线性领域的形式主义,其中只涉及一个图在下一个领导秩序,示出。
We derive the nonequilibrium real-time evolution of an O(N)-invariant scalar quantum field theory in the presence of a nonvanishing expectation value of the quantum field. Using a systematic 1/N expansion of the 2PI effective action to next-to-leading order, we obtain nonperturbative evolution equations which include scattering and memory effects. The equivalence of the direct method, which requires the resummation of an infinite number of skeleton diagrams, with the auxiliary-field formalism, which involves only one diagram at next-to-leading order, is shown.