NONEQUILIBRIUM PHASE-TRANSITIONS IN SYSTEMS WITH INFINITELY MANY ABSORBING STATES

We study two nonequilibrium lattice models exhibiting a continuous pha se transition from an active state to an absorbing state in which the system is trapped. The models have infinitely many absorbing states. W e use one of the models to illustrate how finite-size scaling concepts may be used to enhance computer-simulation studies of the critical be havior. This model is also studied using ordinary steady-state scaling concepts. The results show that the model has the same critical behav ior as directed percolation. The applicability of time-dependent simul ations, which have proven very efficient in the study of systems with a single absorbing state, is explored extensively using several differ ent initial configurations.