CRITICAL-BEHAVIOR OF A DIFFUSIVE MODEL WITH ONE ADSORBING STATE

We study the critical behaviour of a non-equilibrium model for adsorption-desorption with diffusion. We consider a parallel updating rule of the cellular automata type. Without diffusion, it is found that the critical exponents belong to the universality class of directed percolation, as has already been shown for sequential dynamics. When diffusion is present, the critical behaviour can be described in terms of a crossover between the directed percolation regime and a dynamical mean-field regime associated with the case of arbitrarily large diffusion.