HISTOGRAM MONTE-CARLO RENORMALIZATION-GROUP METHOD FOR PHASE-TRANSITION MODELS WITHOUT CRITICAL SLOWING DOWN

Based on the subgraph expansions for phase transition models, we present a histogram Monte Carlo method to calculate the free energy and other physical quantities for such models as continuous functions of the system parameter. The method does not have any critical slowing down. We then use physical quantities thus obtained in a percolation renormalization group method to calculate critical point, critical exponents, and thermodynamic order parameter. Our method gives quite accurate results and may be applied to many phase transition models.