Abstract
The distribution function PL(s) of the local order parameter s in finite blocks of size Ld is studied for Ising models for dimensionalities d=2, 3, and 4 by Monte Carlo methods. A real-space renormalization group based on phenomenological scaling yields fairly accurate results for rather small L (e.g., the standard exponents β and ν for d=3 are found as 2β/ν=1.03±0.01, 1/ν=1.60±0.05). The method can easily be generalized to arbitrary Hamiltonians, including spin dimensionalities n>1.
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