Gluon Condensation in QCD and Supersymmetric QCD

Abstract

Although non-perturbative study of field theories has a long history, It is a feeling shared by many people, perhaps by all of us at this workshop, that it is becoming increasingly more critical for the deep understanding of physical laws of nature. It is probably not an exaggeration to say that it is an emblem of the particle physics of the 80’s. This I believe is an inevitable trend. The development of non-abelian gauge theories In the 70’s has brought us to the stage where we cannot help talking about the derivation of the spectrum of the world with naturalness and economy (unification). This is outside the realm of the perturbation theory, in which one particle requires one field with prescribed characteristics. More dynamical aspects of gauge theories must be understood, and QCD and supersymmetric versions of it will certainly play primary roles as prototypical theories.