GLOBAL COLOR MODEL OF QCD AND ITS RELATIONSHIP TO THE NJL MODEL, CHIRAL PERTURBATION-THEORY AND OTHER MODELS

The Global Colour Model (GCM) of QCD is a very successful model. Not o nly is it formally derivable from QCD but under various conditions it, reduces to the NJL model and also to Chiral Perturbation Theory, and to other models. Results presented include the effective gluon propaga tor, the difference between constituent and exact quark propagators, v arious meson and nucleon observables, a new form for the mass formula for the Nambu-Goldstone mesons of QCD, and the change in the MIT bag c onstant in nuclei.