Analytic Continuation of Thermal $N$-Point Functions from Imaginary- to Real-Energies

Details Analytic Continuation of Thermal $N$-Point Functions from Imaginary- to Real-Energies Analytic Continuation of Thermal $N$-Point Functions from Imaginary- to Real-Energies

1993-07-29

arxiv.org/abs/hep-ph/9307362v1

Phys.Rev. D49 (1994) 4107-4112

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages (2 figures not included), typeset using REVTEX, BI-TP 93/39

Scientific paper

10.1103/PhysRevD.49.4107

We consider thermal $n$-point Green functions in the framework of quantum field theory at finite temperature. We show how analytic continuations from imaginary to real energies relate these functions originally defined in the imaginary-time formalism to retarded and advanced real-time ones. The described method is valid to all orders of perturbation theory. It has the further advantage that it is independent of approximations often applied in actual finite-order calculations.

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