Far-from-equilibrium dynamics with broken symmetries from the 2PI-1/N expansion
High Energy Physics - Phenomenology
2010-02-04 v2 High Energy Physics - Theory
Nuclear Theory
Abstract
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.
Keywords
Cite
@article{arxiv.hep-ph/0201308,
title = {Far-from-equilibrium dynamics with broken symmetries from the 2PI-1/N expansion},
author = {G. Aarts and D. Ahrensmeier and R. Baier and J. Berges and J. Serreau},
journal= {arXiv preprint arXiv:hep-ph/0201308},
year = {2010}
}
Comments
29 pages, 8 figures, PRD version (minor typos corrected, footnote added)