Physics – Condensed Matter
Scientific paper
1999-08-19
Physics
Condensed Matter
3 pages, RevTex
Scientific paper
In this short write-up we argue that self-consistent diagrammatic perturbation theory(i.e. Feynman diagrams) for the one-particle Green function is unable to capture some important qualitative features no matter how self-consistently the Green functions are obtained. This write-up is intended to highlight the short-comings of perturbation theory and also tout the advantages of the sea-boson technique(hep-th/9706006).
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