Simple Physical Approach to Thermal Cutting Rules
arXiv:hep-ph/9606426 · doi:10.1016/0370-2693(96)00919-7
Abstract
A first-principles derivation is given of the imaginary part of a Green's function in real-time thermal field theory. The analysis and its conclusions are simpler than in the usual circled-vertex formalism. The relationship to Cutkosky-like cutting rules is explained.
9 pages, plain tex, 5 figures embedded with epsf -- 2 typos corrected
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