Thermal Operator Representation of Finite Temperature Graphs II

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dc.creatorBrandt, Fernando T.
dc.creatorDas, Ashok
dc.creatorEspinosa, Olivier
dc.creatorFrenkel, Josif
dc.creatorPerez, Silvana
dc.date2006-01-30
dc.date2006-02-09
dc.date.accessioned2026-07-07T11:27:22Z
dc.date.available2026-07-07T11:27:22Z
dc.descriptionUsing the mixed space representation, we extend our earlier analysis to the case of Dirac and gauge fields and show that in the absence of a chemical potential, the finite temperature Feynman diagrams can be related to the corresponding zero temperature graphs through a thermal operator. At non-zero chemical potential we show explicitly in the case of the fermion self-energy that such a factorization is violated because of the presence of a singular contact term. Such a temperature dependent term which arises only at finite density and has a quadratic mass singularity cannot be related, through a regular thermal operator, to the fermion self-energy at zero temperature which is infrared finite. Furthermore, we show that the thermal radiative corrections at finite density have a screening effect for the chemical potential leading to a finite renormalization of the potential.
dc.description13 pages, 4 figures. Revised version (minor changes) accepted for publication in Phys. Rev. D
dc.identifierhttps://arxiv.org/abs/hep-th/0601224
dc.identifierhttp://arxiv.org/abs/hep-th/0601224
dc.identifierPhys.Rev.D73:065010,2006
dc.identifierdoi:10.1103/PhysRevD.73.065010
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/196129
dc.subjectHigh Energy Physics - Theory
dc.subjectHigh Energy Physics - Phenomenology
dc.titleThermal Operator Representation of Finite Temperature Graphs II
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