Renormalization group approach and universality classes for 3D spin glass models

A Renormalization Group approach to disordered spin systems is presented, based on a real space coarse graining of the overlap distribution. Universality classes are defined through generalized disorder distribution, thus including a large set of models such as Ising ferromagnet, Gaussian and Z2 spin glasses, fully frustrated models. The relations between Z2 gauge models and spin glasses find a natural framework within this context. The approach is supported by Monte Carlo renormalization group computations in three dimensions. Precise estimates of the critical temperature and indexes in the difficult 3D case are also obtained with moderate computer time (Author)