O(N) linear sigma model beyond the Hartree approximation at finite temperature

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dc.creatorBaacke, J.
dc.creatorMichalski, Stefan
dc.date2003-12-02
dc.date.accessioned2026-07-07T03:51:26Z
dc.date.available2026-07-07T03:51:26Z
dc.descriptionWe study the O(N) linear sigma model with spontaneous symmetry breaking at finite temperature in the framework of the two-particle point-irreducible (2PPI) effective action. We go beyond the Hartree approximation by including the two-loop contribution, i.e., the sunset diagram. A phase transition of second order is found, whereas it is of first order in the one-loop Hartree approximation. Furthermore, we show the temperature-dependence of the variational mass parameters and comment on their relation to the physical sigma and pion masses.
dc.description6 pages. To appear in the proceedings of International Workshop on Quantum Field Theory Under the Influence of External Conditions (QFEXT '03). Norman OK (USA), September 2003
dc.identifierhttps://arxiv.org/abs/hep-ph/0312031
dc.identifierhttp://arxiv.org/abs/hep-ph/0312031
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/43096
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Theory
dc.titleO(N) linear sigma model beyond the Hartree approximation at finite temperature
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