Gauge-fixing dependence of Φ-derivable approximations -: art. no. 065014

被引:86
作者
Arrizabalaga, A [1 ]
Smit, J [1 ]
机构
[1] Univ Amsterdam, Inst Theoret Phys, NL-1018 XE Amsterdam, Netherlands
关键词
D O I
10.1103/PhysRevD.66.065014
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We examine the problem of gauge dependence of the two-particle irreducible (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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页数:8
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