Approximate spectral functions in thermal field theory

Details Approximate spectral functions in thermal field theory Approximate spectral functions in thermal field theory

1995-10-17

arxiv.org/abs/hep-ph/9510322v3

Phys.Rev. D54 (1996) 5239-5244

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, latex, 3 figures included. Major rewriting of paper. Available also at ftp://tpri6c.gsi.de/pub/phenning/h95comm/ or

Scientific paper

10.1103/PhysRevD.54.5239

Causality requires, that the (anti-) commutator of two interacting field operators vanishes for space-like coordinate differences. This implies, that the Fourier transform of the spectral function of this quantum field should vanish in the space-like domain. We find, that this requirement imposes some constraints on the use of resummed propagators in high temperature gauge theory.

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