Two-particle renormalizations in many-fermion perturbation theory: Importance of the Ward identity

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dc.creatorJanis, V.
dc.date2002-10-30
dc.date2002-11-05
dc.date.accessioned2026-07-07T10:02:55Z
dc.date.available2026-07-07T10:02:55Z
dc.descriptionWe analyze two-particle renormalizations within many-fermion perturbation expansion. We show that present diagrammatic theories suffer from lack of a direct diagrammatic control over the physical two-particle functions. To rectify this we introduce and prove a Ward identity enabling an explicit construction of the self-energy from a given two-particle irreducible vertex. Approximations constructed in this way are causal, obey conservation laws and offer an explicit diagrammatic control of singularities in dynamical two-particle functions.
dc.descriptionREVTeX4, 4 pages, 2 EPS figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0210679
dc.identifierhttp://arxiv.org/abs/cond-mat/0210679
dc.identifierJ. Phys.:Condens. Matter 15 (2003) L311
dc.identifierdoi:10.1088/0953-8984/15/21/102
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/169143
dc.subjectStrongly Correlated Electrons
dc.subjectStatistical Mechanics
dc.titleTwo-particle renormalizations in many-fermion perturbation theory: Importance of the Ward identity
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