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2PI effective action and gauge invariance problems | | M.E.Carrington
; G. Kunstatter
; H. Zaraket
; | | Date: |
8 Sep 2003 | | Journal: | Eur.Phys.J. C42 (2005) 253-259 | | Subject: | hep-ph | | Affiliation: | Brandon), G. Kunstatter and H. Zaraket (Winnipeg | | Abstract: | The problem of maintaining gauge invariance when truncating the two particle irreducible (2PI) effective action has been studied recently by several authors. Here we give a simple and very general derivation of the gauge dependence identities for the off-shell 2PI effective action. We consider the case where the gauge is fixed by an arbitrary function of the quantum gauge field, subject only to the restriction that the Faddeev-Popov matrix is invertable. We also study the background field gauge. We address the role that these identies play in solving gauge invariance problems associated with physical quantities calculated using a truncated on-shell 2PI effective action. | | Source: | arXiv, hep-ph/0309084 | | Services: | Forum | Review | PDF | Favorites | |
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