title: Systems with two symmetric absorbing states: relating the microscopic dynamics with the macroscopic behavior.
abstract: We propose a general approach to study spin models with two symmetric absorbing states. Starting from the microscopic dynamics on a square lattice, we derive a Langevin equation for the time evolution of the magnetization field, that successfully explains coarsening properties of a wide range of nonlinear voter models and systems with intermediate states. We find that the macroscopic behavior only depends on the first derivatives of the spin-flip probabilities. Moreover, an analysis of the mean-field term reveals the three types of transitions commonly observed in these systems-generalized voter, Ising and directed percolation. Monte Carlo simulations of the spin dynamics qualitatively agree with theoretical predictions.
authors.affiliation: IFISC, Instituto de Física Interdisciplinar y Sistemas Complejos (CSIC-UIB), E-07122 Palma de Mallorca, Spain. federico@ifisc.uib-csic.es
authors.forename: Federico
authors.initials: F
authors.lastname: Vazquez
authors.forename: Cristóbal
authors.initials: C
authors.lastname: López