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|Type:||Artigo de periódico|
|Title:||The Cumulant Expansion Of The Periodic Anderson Model; Completeness And The Φ-derivable Approximation|
|Abstract:||The approximate Green's functions of the localized electrons, obtained by the cumulant expansion of the periodic Anderson model in the limit of infinite Coulomb repulsion, do not satisfy completeness even for the simplest families of diagrams, like the chain approximation. The idea that employing Φ-derivable approximations would solve this difficulty is shown to be false by proving that the chain approximation is Φ-derivable and does not satisfy completeness. After finding a family of diagrams with Green's functions that satisfy completeness, we put forward a conjecture that shows how to select families of diagrams with this property.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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