Spectral functions for composite fields and viscosity in hot scalar field theory
Enke Wang, Xiaofei Zhang, Ulrich Heinz
Abstract
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 ϕ4 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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