Abstract
We discuss the problem of how to calculate Landau and Landau-Ginzburg free energies for lattice spin models from computer simulations. In setting up a proper simulation algorithm, emphasis is placed on the coarse grained nature of these potentials, which must be take into account by any suitable simulation approach. The development of theory and simulation results is reviewed and the results of a novel Monte Carlo algorithm using Fourier amplitudes are presented, which partly confirm and sharpen the assumptions on the temperature behavior of the Landau-Ginzburg coefficients made in the literature.
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