Spectral functions for composite fields and viscosity in hot scalar field theory

Details Spectral functions for composite fields and viscosity in hot scalar field theory Spectral functions for composite fields and viscosity in hot scalar field theory

1995-09-19

arxiv.org/abs/hep-ph/9509331v1

Phys.Rev.D53:5978-5981,1996

Physics

High Energy Physics

High Energy Physics - Phenomenology

REVTeX, 17 pages, 5 uuencoded ps-figures

Scientific paper

10.1103/PhysRevD.53.5978

We derive a spectral representation for the two-point Green function for arbitrary composite field operators in Thermo Field Dynamics (TFD). A simple way for calculating the spectral density within TFD is pointed out and compared with known results from the imaginary time formalism. The method is applied to hot $\phi^4$ theory. We give a compact derivation of the one-loop contribution to the shear viscosity and show that it is dominated by low-momentum plasmons.

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