Critical behaviour of an m-vector spin glass for m=∞

Abstract
A special case of the spin glass model is considered in which the number of spin components m becomes infinitely large. The authors derive a field theory Hamiltonian for this model and show that its upper critical dimensionality is eight. The critical exponents for this theory are calculated in an expansion in epsilon =8-d to second order. They notice that this second-order expansion is identical to that for the p to infinity limit of the Q3 model in epsilon =6-d.