Interpolating quantum electrodynamics between instant and front forms

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dc.contributor.authorJi, Chueng-Ryong
dc.contributor.authorLi, Ziyue
dc.contributor.authorMa, Bailing
dc.contributor.authorSuzuki, Alfredo Takashi [UNESP]
dc.contributor.institutionNorth Carolina State University
dc.contributor.institutionLa Sierra University
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2018-12-11T17:22:36Z
dc.date.available2018-12-11T17:22:36Z
dc.date.issued2018-08-01
dc.description.abstractThe instant form and the front form of relativistic dynamics proposed by Dirac in 1949 can be linked by an interpolation angle parameter δ spanning between the instant form dynamics (IFD) at δ=0 and the front form dynamics, which is now known as the light-front dynamics (LFD) at δ=π/4. We present the formal derivation of the interpolating quantum electrodynamics (QED) in the canonical field theory approach and discuss the constraint fermion degree of freedom, which appears uniquely in the LFD. The constraint component of the fermion degrees of freedom in LFD results in the instantaneous contribution to the fermion propagator, which is genuinely distinguished from the ordinary equal-time forward and backward propagation of relativistic fermion degrees of freedom. As discussed recently, the helicity of the on-mass-shell fermion spinors in LFD is also distinguished from the ordinary Jacob-Wick helicity in the IFD with respect to whether the helicity depends on the reference frame or not. To exemplify the characteristic difference of the fermion propagator between IFD and LFD, we compute the helicity amplitudes of typical QED processes such as e+e-→γγ and eγ→eγ and present the whole landscape of the scattering amplitudes in terms of the frame dependence or the scattering angle dependence with respect to the interpolating angle dependence. Our analysis clarifies any conceivable confusion in the prevailing notion of the equivalence between the infinite momentum frame approach and the LFD.en
dc.description.affiliationDepartment of Physics North Carolina State University
dc.description.affiliationPhysics Department La Sierra University
dc.description.affiliationInstituto de Física Teórica-UNESP Universidade Estadual Paulista, Rua Dr. Bento Teobaldo Ferraz, 271
dc.description.affiliationUnespInstituto de Física Teórica-UNESP Universidade Estadual Paulista, Rua Dr. Bento Teobaldo Ferraz, 271
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipU.S. Department of Energy
dc.description.sponsorshipIdFAPESP: 2014/20892-2
dc.description.sponsorshipIdU.S. Department of Energy: DE-FG02-03ER41260
dc.identifierhttp://dx.doi.org/10.1103/PhysRevD.98.036017
dc.identifier.citationPhysical Review D, v. 98, n. 3, 2018.
dc.identifier.doi10.1103/PhysRevD.98.036017
dc.identifier.file2-s2.0-85052995823.pdf
dc.identifier.issn2470-0029
dc.identifier.issn2470-0010
dc.identifier.scopus2-s2.0-85052995823
dc.identifier.urihttp://hdl.handle.net/11449/176814
dc.language.isoeng
dc.relation.ispartofPhysical Review D
dc.relation.ispartofsjr1,801
dc.relation.ispartofsjr1,801
dc.rights.accessRightsAcesso aberto
dc.sourceScopus
dc.titleInterpolating quantum electrodynamics between instant and front formsen
dc.typeArtigo
unesp.author.lattes7511139477883318[4]

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