LARGE N-PHASE-TRANSITIONS AND MULTI-CRITICAL BEHAVIOR IN GENERALIZED 2D QCD

Using matrix model techniques we investigate the large N limit of gene ralized 2D Yang-Mills theory. The model has a very rich phase structur e. It exhibits multi-critical behavior and reveals a third order phase transitions at ail genera besides torus. This is to be contrasted wit h ordinary 2D Yang-Mills which, at large N, exhibits phase transition only for spherical topology.