Metal-insulator transition in a Hubbard model with random and all-to-all hopping and exchange

We examine a N site Hubbard model with an on-site repulsion U, and random and all-to-all hopping, t, and exchange J. In the large N limit, the problem reduces to a single site symmetric Anderson impurity coupled to self-consistent bosonic and fermionic baths. We present large M (for a model with SU(M) spin symmetry) and renormalization group analyses of a metal-insulator transition in this model.