The Epstein-Glaser causal approach to the light-front QED(4). II: Vacuum polarization tensor

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dc.contributor.authorBufalo, R. [UNESP]
dc.contributor.authorPimentel, B. M. [UNESP]
dc.contributor.authorSoto, D. E. [UNESP]
dc.contributor.institutionUniv Helsinki
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2015-03-18T15:53:16Z
dc.date.available2015-03-18T15:53:16Z
dc.date.issued2014-12-01
dc.description.abstractIn this work we show how to construct the one-loop vacuum polarization for light-front QED(4) in the framework of the perturbative causal theory. Usually, in the canonical approach, it is considered for the fermionic propagator the so-called instantaneous term, but it is known in the literature that this term is controversial because it can be omitted by computational reasons; for instance, by compensation or vanishing by dimensional regularization. In this work we propose a solution to this paradox. First, in the Epstein-Glaser causal theory, it is shown that the fermionic propagator does not have instantaneous term, and with this propagator we calculate the one-loop vacuum polarization, from this calculation it follows the same result as those obtained by the standard approach, but without reclaiming any extra assumptions. Moreover, since the perturbative causal theory is defined in the distributional framework, we can also show the reason behind our obtaining the same result whether we consider or not the instantaneous fermionic propagator term. (C) 2014 Elsevier Inc. All rights reserved.en
dc.description.affiliationUniv Helsinki, Dept Phys, FI-00014 Helsinki, Finland
dc.description.affiliationUNESP Sao Paulo State Univ, Inst Fis Teor, BR-01140070 Sao Paulo, Brazil
dc.description.affiliationUnespUNESP Sao Paulo State Univ, Inst Fis Teor, BR-01140070 Sao Paulo, Brazil
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipIdFAPESP: 11/20653-3
dc.format.extent1062-1084
dc.identifierhttp://dx.doi.org/10.1016/j.aop.2014.10.005
dc.identifier.citationAnnals Of Physics. San Diego: Academic Press Inc Elsevier Science, v. 351, p. 1062-1084, 2014.
dc.identifier.doi10.1016/j.aop.2014.10.005
dc.identifier.issn0003-4916
dc.identifier.urihttp://hdl.handle.net/11449/116414
dc.identifier.wosWOS:000346451900060
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofAnnals Of Physics
dc.relation.ispartofjcr2.367
dc.relation.ispartofsjr0,987
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectLight-front field theoriesen
dc.subjectEpstein-Glaser causal methoden
dc.subjectRadiative correctionen
dc.titleThe Epstein-Glaser causal approach to the light-front QED(4). II: Vacuum polarization tensoren
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.author.orcid0000-0003-1879-1560[1]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Física Teórica (IFT), São Paulopt

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