Computing Spectral Densities in Finite Temperature Field Theory

Physics – High Energy Physics – High Energy Physics - Phenomenology

Scientific paper

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51 pages, in latex using revtex macros, 12 figures in postscript, appended. UW/PT-92-03

Scientific paper

10.1103/PhysRevD.47.4586

Convenient Cutkosky-like diagrammatic rules for computing the spectral densities of arbitrary two-point correlation functions in finite temperature field theory are derived. The approach is based on an explicit analytic continuation of imaginary-time Feynman diagrams and avoids the complications of real-time finite temperature perturbation theory. The application of this method to the perturbative evaluation of transport coefficients is briefly discussed.

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