Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1994-01-19
Int.J.Mod.Phys. A10 (1995) 167-198
Physics
High Energy Physics
High Energy Physics - Theory
36 pages + 7 uuencoded postcript figures, Latex, Preprint DFUB-93-17
Scientific paper
We consider a wide class of two-dimensional models as gauge theories, Gross-Neveu model, $O(N)$ and $CP^{N-1}$-like models using a formalism based on the introduction of bilocal fields that permits to perform easily the large-N expansion of this set of models in a unified and general way. We mainly discuss the $SU(N)$ gauge field theory minimally coupled to fermionic plus bosonic matter in the fundamental representation, and we obtain within the path integral approach exact equations for the particle spectrum, also in presence of renormalizable polynomial potentials. Finally, we discuss the correspondence between this new approach and the one previously used in the context of the $O(N)$ vector models.
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