MEAN-FIELD APPROXIMATION WITH COHERENT ANOMALY METHOD FOR A NONEQUILIBRIUM MODEL

A mean-field approximation for a 1D non-equilibrium lattice model, known as model A [1], is considered allowing us to compute the probability of a configuration of a given duster of sites. The mean-field equations are numerically solved in the stationary regime for different duster sizes L (less-than-or-equal-to 15). From a finite-size analysis and the application of the coherent anomaly method (CAM) [2] we compute the critical parameter of the model, the correlation length critical exponent nu(perpendicular-to) and the order parameter critical exponent beta; the results are in agreement with those obtained by other methods.