Adaptive optimization of wave functions for fermion lattice models - art. no. 077502

We present a simulation algorithm for Hamiltonian fermion lattice models. A guiding trial wave function is adaptively optimized during Monte Carlo evo lution. NVe apply the method to the two dimensional Gross-Neveu model and a nalyze systematic errors in the study of ground state properties. We show t hat accurate measurements can be achieved by a proper extrapolation in the algorithm-free parameters.