Multi-valuedness of the Luttinger-Ward functional in the Fermionic and Bosonic System with Replicas

We study the properties of the Luttinger-Ward functional (LWF) in a simplified Hubbard-type model without time or spatial dimensions, but with \(N\) identical replicas located on a single site. The simplicity of this \((0+0)d\) model permits an exact solution for all \(N\) and for both bosonic and f...

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Veröffentlicht in:	arXiv.org 2018-12
Hauptverfasser:	Kim, Aaram J, Sacksteder, Vincent
Format:	Artikel
Sprache:	eng
Schlagworte:	Green's functions Mapping Physics - Strongly Correlated Electrons Statistics
Online-Zugang:	Volltext
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