Applicability of the linear delta expansion for the lambda phi(4) field theory at finite temperature in the symmetric and broken phases

dc.contributor.authorFarias, R. L. S.
dc.contributor.authorKrein, Gastão Inácio [UNESP]
dc.contributor.authorRamos, Rudnei O.
dc.contributor.institutionUniv Estado Rio de Janeiro
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2013-09-30T18:58:10Z
dc.date.accessioned2014-05-20T14:11:45Z
dc.date.available2013-09-30T18:58:10Z
dc.date.available2014-05-20T14:11:45Z
dc.date.issued2008-09-01
dc.description.abstractThe thermodynamics of a scalar field with a quartic interaction is studied within the linear delta expansion (LDE) method. Using the imaginary-time formalism the free energy is evaluated up to second order in the LDE. The method generates nonperturbative results that are then used to obtain thermodynamic quantities like the pressure. The phase transition pattern of the model is fully studied, from the broken to the symmetry restored phase. The results are compared with those obtained with other nonperturbative methods and also with ordinary perturbation theory. The results coming from the two main optimization procedures used in conjunction with the LDE method, the principle of minimal sensitivity (PMS) and the fastest apparent convergence (FAC) are also compared with each other and studied in which cases they are applicable or not. The optimization procedures are applied directly to the free energy.en
dc.description.affiliationUniv Estado Rio de Janeiro, Dept Fis Teor, BR-20550013 Rio de Janeiro, Brazil
dc.description.affiliationUniv Estadual Paulista, Inst Fis Teor, BR-01405900 São Paulo, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Inst Fis Teor, BR-01405900 São Paulo, Brazil
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ)
dc.format.extent10
dc.identifierhttp://dx.doi.org/10.1103/PhysRevD.78.065046
dc.identifier.citationPhysical Review D. College Pk: Amer Physical Soc, v. 78, n. 6, p. 10, 2008.
dc.identifier.doi10.1103/PhysRevD.78.065046
dc.identifier.fileWOS000259692800190.pdf
dc.identifier.issn1550-7998
dc.identifier.lattes5704289678296630
dc.identifier.urihttp://hdl.handle.net/11449/24485
dc.identifier.wosWOS:000259692800190
dc.language.isoeng
dc.publisherAmer Physical Soc
dc.relation.ispartofPhysical Review D
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.titleApplicability of the linear delta expansion for the lambda phi(4) field theory at finite temperature in the symmetric and broken phasesen
dc.typeArtigo
dcterms.licensehttp://publish.aps.org/authors/transfer-of-copyright-agreement
dcterms.rightsHolderAmer Physical Soc
unesp.author.lattes5704289678296630
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Física Teórica (IFT), São Paulopt

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