2PI effective action and gauge invariance problems
High Energy Physics - Phenomenology
2011-09-13 v2
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.
Cite
@article{arxiv.hep-ph/0309084,
title = {2PI effective action and gauge invariance problems},
author = {M. E. Carrington and G. Kunstatter and H. Zaraket},
journal= {arXiv preprint arXiv:hep-ph/0309084},
year = {2011}
}
Comments
11 pages, version accepted for publication in Eur. Phys. Jour. C