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arxiv: hep-th/0108139 · v1 · pith:BEOFKGZTnew · submitted 2001-08-20 · ✦ hep-th

Scattering amplitude and shift in self-energy in medium

classification ✦ hep-th
keywords self-energyexpansionmediumvirialamplitudeanalysischaracterisedchemical
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Two simple proofs are presented for the first order virial expansion of the self-energy of a particle moving through a medium, characterised by temperature and/or chemical potential(s). One is based on the virial expansion of the self-energy operator itself, while the other is on the analysis of its Feynman diagrams in configuration space.

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