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The 2 - particle irreducible effective action in gauge theories

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arxiv hep-ph/0402196 v1 pith:LN6MOELT submitted 2004-02-18 hep-ph

The 2 - particle irreducible effective action in gauge theories

classification hep-ph
keywords actionciteeffectivegaugeirreducibletheoriesapplicationappropiate
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The goal of this paper is to develop the formalism of the two-particle irreducible (2PI) \cite{LW61} (or Cornwall - Jackiw - Tomboulis (CJT) \cite {CJT}) effective action (EA) in a way appropiate to its application to non equilibrium gauge theories. We hope this review article will stimulate new work into this field.

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    A new algorithm counts degrees of freedom in open EFTs from equations of motion using dual advanced equations for non-Lagrangian systems with constraints and gauges.