Light - Front Dynamics and Light - Front Qcd

In this article, I will try to address some aspects of nonperturbative QCD. The theory of nonperturbative QCD (at the hadronic scale) has indeed not been well defined at the present time. Firstly, how much we can understand about the real theory of the strong interaction from the canonical QCD structure is totally unknown. Secondly, there are in the literature many models or effective theories that are inspired by QCD, and yet they cannot be derived directly from QCD, although they are more or less successful in describing hadronic phenomenology. Undoubtedly, to discuss the problems of nonperturbative QCD is not a simple task. Yet the fact that little progress has been made for the past twenty years on the study of nonperturbative QCD (i.e., the explicit solution of the dynamics of quarks and gluons in the strong coupling regions) may force us to think about whether one is able to extend the traditional approach of the perturbative field theory to the description of a strong coupling theory. The covariant perturbative framework lacks the simple Schrödinger