ABSTRACT

This chapter presents more direct criteria for confinement by computation of the electric force between charges and the dielectric permeability of the vacuum. It explains analogies with some phenomena in solid state physics. In Non-Abelian cases with global symmetries it is quite straightforward to introduce an analogue of the superfluid density. First it is useful to understand the results obtained, using a special diagram technique. Namely, it is possible to represent () the free H-field operator by a solid line, pseudoparticles by open circles and the Coulomb interaction between pseudoparticles by dashed lines. It is possible to draw more complicated diagrams containing both solid and dashed lines, but all of them are small for small momenta and charges. It is evident that there should exist an infinite resonance spectrum in theory, and it is tempting to find it directly by considering the correlation functions for operators of higher spin.