Gauge-fixing dependence of Phi-derivable approximations

Details Gauge-fixing dependence of Phi-derivable approximations Gauge-fixing dependence of Phi-derivable approximations

2002-07-03

arxiv.org/abs/hep-ph/0207044v1

Phys.Rev. D66 (2002) 065014

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, revtex

Scientific paper

10.1103/PhysRevD.66.065014

We examine the problem of gauge dependence of the 2PI effective action and its Phi-derivable approximations in gauge theories. The dependence on the gauge-fixing condition is obtained. The result shows that Phi-derivable approximations, defined as truncations of the 2PI effective action at a certain order, have a controlled gauge dependence, i.e. the gauge dependent terms appear at higher order than the truncation order. Furthermore, using the stationary point obtained for the approximation to evaluate the complete 2PI effective action boosts the order at which the gauge dependent terms appear to twice the order of truncation. We also comment on the significance of this controlled gauge dependence.

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