The SU(2) $\times$ SU(2) chiral spin model in terms of SO(3) and Z${}_2$ variables: vortices and disorder

Tamás G. Kovaács, E. T. Tomboulis

We rewrite the two-dimensional SU(2)$\times$ SU(2) chiral spin model in terms of SO(3) and {\bf Z}${}_2$ degrees of freedom. The transformation, which is motivated by a similar repre…