Functional Methods, Nonperturbative Solutions
Until now, we have been concerned mainly with the perturbative aspects of QCD. For these, the use of either a canonical or path integral formulation of field theory is largely a matter of taste. Nonperturbative aspects of QCD, however, can be formulated with greater clarity in a functional language. In this section, we briefly review the Feynman path integral formalism, in particular as applied to field theory. Of course, this is no substitute for a detailed treatment, for which the interested reader may consult the lectures of Fadeyev (1976) and Lee (1976) or the textbooks of Itzykson and Zuber (1980) and Fadeyev and Slavnov (1980).
KeywordsGauge Transformation Homotopy Class Deep Inelastic Scattering Functional Method Feynman Rule
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