The 1/N expansion method in quantum field theory
classification
✦ hep-th
nucl-th
keywords
methodexpansionfieldfieldsmodelquantumtheorybriefly
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The motivations of the 1/N expansion method in quantum field theory are explained. The method is first illustrated with the O(N) model of scalar fields. A second example is considered with the two-dimensional Gross-Neveu model of fermion fields with global U(N) and discrete chiral symmetries. The case of QCD is briefly sketched.
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