3-dimensional Rules for Finite-Temperature Loops
arXiv:hep-th/9704078 · doi:10.1016/S0370-2693(97)00435-8
Abstract
We present simple diagrammatic rules to write down Euclidean n-point functions at finite temperature directly in terms of 3-dimensional momentum integrals, without ever performing a single Matsubara sum. The rules can be understood as describing the interaction of the external particles with those of the thermal bath.
12 pages, 4 figures, to appear in Physics Letters B