Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1997-06-06
Phys.Rev. D56 (1997) 2303-2316
Physics
High Energy Physics
High Energy Physics - Theory
48 pages, no figures. This is a plain LaTeX file. No special macros are needed
Scientific paper
10.1103/PhysRevD.56.2303
Various effective field theories in four dimensions are shown to have exact non-trivial solutions in the limit as the number $N$ of fields of some type becomes large. These include extended versions of the U(N) Gross-Neveu model, the non-linear O(N) $\sigma$-model, and the $CP^{N-1}$ model. Although these models are not renormalizable in the usual sense, the infinite number of coupling types allows a complete cancellation of infinities. These models provide qualitative predictions of the form of scattering amplitudes for arbitrary momenta, but because of the infinite number of free parameters, it is possible to derive quantitative predictions only in the limit of small momenta. For small momenta the large-$N$ limit provides only a modest simplification, removing at most a finite number of diagrams to each order in momenta, except near phase transitions, where it reduces the infinite number of diagrams that contribute for low momenta to a finite number.
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