Cutting rules in the real time formalisms at finite temperature

Details Cutting rules in the real time formalisms at finite temperature Cutting rules in the real time formalisms at finite temperature

1997-01-29

arxiv.org/abs/hep-ph/9701410v1

Nucl.Phys. B508 (1997) 483-505

Physics

High Energy Physics

High Energy Physics - Phenomenology

25 pages, LaTeX file with "article" style, 6 postscript figures included by \epsfbox

Scientific paper

10.1016/S0550-3213(97)00511-7

In this paper, we review the set of rules specific to the calculation of the imaginary part of a Green's function at finite temperature in the real-time formalisms. Emphasis is put on the clarification of a recent controversy concerning these rules in the "1/2" formalism, more precisely on the issue related to the interpretation of these rules in terms of cut diagrams, like at T=0. On the second hand, new results are presented, enabling one to calculate the imaginary part of thermal Green's functions in other formulations of the real-time formalism, like the "retarded/advanced" formalism in which a lot of simplifications occur.

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