Sur la fonction de green à une particule
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Roger Balian; Cyrano De Dominicis
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Article
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1960
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Elsevier Science
⚖ 763 KB
Some analytical properties of the mass operator are examined in perturbation theory, and a simple form of the one particle Green's function for a grand canonical ensemble is ob ta in ed by analytical continuati on . An approxima.tion is then considered, which neglects terms where energy denomin a t