A reintroduction of dynamical SU(2) gauge fields in Hubbard models

This is a preprint from 1990, in which it is explained how non-Abelian gauge magnets originate as effective dynamics in models of hopping particles. In particular, an explicit model is discussed in which both link and plaquette terms appear. The motivation (as explained in a brief apology) to reintroduce the idea is some recent theoretical progress on the topic of optical lattices.