Selfconsistent approximations, symmetries and choice of representation

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dc.creatorLeupold, Stefan
dc.date2006-10-26
dc.date.accessioned2026-07-07T10:25:48Z
dc.date.available2026-07-07T10:25:48Z
dc.descriptionIn thermal field theory selfconsistent (Phi-derivable) approximations are used to improve (resum) propagators at the level of two-particle irreducible diagrams. At the same time vertices are treated at the bare level. Therefore such approximations typically violate the Ward identities connected to internal symmetries. Examples are presented how such violations can be tamed by a proper choice of representation for the fields which describe the system under consideration. These examples cover the issue of massless Goldstone bosons in the linear sigma model and the Nambu--Jona-Lasinio model and the problem of current conservation in theories with massive vector mesons.
dc.description13 pages
dc.identifierhttps://arxiv.org/abs/hep-ph/0610356
dc.identifierhttp://arxiv.org/abs/hep-ph/0610356
dc.identifierPhys.Lett.B646:155-164,2007
dc.identifierdoi:10.1016/j.physletb.2007.01.028
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/176665
dc.subjectHigh Energy Physics - Phenomenology
dc.titleSelfconsistent approximations, symmetries and choice of representation
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