Application of finite size scaling to Monte Carlo simulations

A new application of finite size scaling to Monte Carlo simulations is introduced. Using this technique, critical behavior can be investigated at temperatures arbitrarily close to the critical point without large lattice sizes. Applying this method to the two-dimensional standard O (3) model it is shown that for the correlation length asymptotic scaling holds for 2. 25; the magnetic susceptibility converges to the asymptotic scaling very slowly. In the scaling region, it is observed that the specific heat decreases with, which implies no singular behavior of the specific heat for this model.