FIXED-CLUSTER ACCELERATION ALGORITHM FOR SPIN SYSTEMS

A recently introduced cluster acceleration algorithm for spin models [ J. Machta et al., Phys. Rev. Lett. 75, 2792 (1995)] based on invasion percolation is generalized to temperatures away from the critical poin t using concepts of random bond percolation. The generalized algorithm is equivalent to an ''optimized'' version of the Swendsen-Wang cluste r algorithm [R. H. Swendsen and J. S. Wang, Phys. Rev. Lett. 58, 86 (1 987)], and we demonstrate its success and speed at all temperatures fo r the d=2 Ising model. We argue that the previously discussed connecti on to self-organized criticality may be viewed as one limit of the fix ed-cluster algorithm.