Why Self-Consistent Diagrammatic Perturbation Theory is `just' Perturbation Theory

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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).
3 pages, RevTex

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Condensed Matter

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http://salesiana.dossiersoluciones.com/handle/123456789/29610

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/9908269
 http://arxiv.org/abs/cond-mat/9908269

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arXiv