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
复制标题
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:
--
复制
发表时间:
2002
期刊:
影响因子:
--
通讯作者:
J. Serreau
中科院分区:
文献类型:
--
作者:
G. Aarts;D. Ahrensmeier;R. Baier;J. Berges;J. Serreau
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.