Φ-derivable approximations in gauge theories
classification
✦ hep-ph
keywords
gaugeapproximationsderivablemethodtheoriesarguearisebose
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We discuss the method of $\Phi$-derivable approximations in gauge theories. There, two complications arise, namely the violation of Bose symmetry in correlation functions and the gauge dependence. For the latter we argue that the error introduced by the gauge dependent terms is controlled, therefore not invalidating the method.
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