Two-dimensional massless fermion field theories with quartic interactions are analyzed. These models 10 3235

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Ure have carried out a semiclassical calculation of the particle spectrum in the GrossNeveu model. It is a two-dimensional model with N species of fermions interacting through a symmetrical scalar-scalar interaction and is renormalizable, asymptotically free, and exhibits spontaneous symmetry breaking. We find a rich spectrum of particles which can be interpreted a s fermion-antifermion bound states and multifermion bound states. These states fall into supermultiplets whose origin we do not completely understand. The binding mechanism i s a vacuum-polarization effect rather than the direct interaction between particles. A general method for handling fermions in semiclassical calculations is developed.

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