Retarded Green's functions and forward scattering amplitudes in thermal field theory

Retarded Green's functions and forward scattering amplitudes in thermal field theory

Autor Brandt, F. T. Google Scholar
Das, A. Google Scholar
Frenkel, J. Google Scholar
Silva, A. J. da Google Scholar
Instituição Universidade Federal de São Paulo (UNIFESP)
Univ Rochester
Resumo 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. [S30556-2821(99)06304-8].
Idioma Inglês
Data de publicação 1999-03-15
Publicado em Physical Review D. College Pk: American Physical Soc, v. 59, n. 6, 8 p., 1999.
ISSN 0556-2821 (Sherpa/Romeo, fator de impacto)
Publicador American Physical Soc
Extensão 8
Fonte http://dx.doi.org/10.1103/PhysRevD.59.065004
Direito de acesso Acesso restrito
Tipo Artigo
Web of Science WOS:000079234400065
Endereço permanente http://repositorio.unifesp.br/handle/11600/26047

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