HERMITIAN MATRIX MODEL WITH PLAQUETTE INTERACTION

We study a hermitian (n + 1)-matrix model with plaquette interaction, Sigma(i=1)(n) MA(i)MA(i). By means of a conformal transformation we re write the model as an O(rt) model on a random lattice with a non-polyn omial potential. This allows us to solve the model exactly, We investi gate the critical properties of the plaquette model and find that for n is an element of ] - 2, 2] the model belongs to the same universalit y class as the O(n) model on a random lattice.