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

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arxiv hep-ph/0201308 v2 pith:POWNFDAT submitted 2002-01-31 hep-ph hep-thnucl-th

G. Aarts , D. Ahrensmeier , R. Baier , J. Berges , J. Serreau This is my paper · ORCID
classification hep-phhep-thnucl-th
keywords evolutionexpansionfieldnext-to-leadingorderquantumactionauxiliary-field
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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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  1. Non-equilibrium dynamics of Goldstone excitation from holography

    hep-ph 2024-12 conditional novelty 6.0 of 10

    Holographic simulations with dynamical pions show a prethermalization stage at non-critical temperatures and a fitted k^2 t scaling, claimed as evidence for a non-thermal fixed point.

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