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

Details Far-from-equilibrium dynamics with broken symmetries from the 2PI-1/N expansion Far-from-equilibrium dynamics with broken symmetries from the 2PI-1/N expansion

2002-01-31

arxiv.org/abs/hep-ph/0201308v2

Phys.Rev.D66:045008,2002

Physics

High Energy Physics

High Energy Physics - Phenomenology

29 pages, 8 figures, PRD version (minor typos corrected, footnote added)

Scientific paper

10.1103/PhysRevD.66.045008

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.

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