Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1998-09-24
Phys.Rev. D59 (1999) 065004
Physics
High Energy Physics
High Energy Physics - Theory
10 pages and figures in the eepic format
Scientific paper
10.1103/PhysRevD.59.065004
In this paper, we give a simple diagrammatic identification of the unique combination of the causal n-point vertex functions in the real time formalism that would coincide with the corresponding functions obtained in the imaginary time formalism. Furthermore, we give a simple calculational method for evaluating the temperature dependent parts of the retarded vertex functions, to one loop, by identifying them with the forward scattering amplitudes of on-shell thermal particles. As an application of the method, we calculate and show that the temperature dependent parts of all the retarded functions vanish at one loop order for 1+1 dimensional massless QED. We further point out that, in this model, in fact, the temperature dependent parts of all the retarded vertex functions vanish to all orders in perturbation theory.
Brandt Fernando T.
da Silva Adilson Jose
Das Ashok
Frenkel Josif
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