DAMAGE SPREADING IN THE ISING-MODEL WITH GLAUBER DYNAMICS

We present accurate simulations of damage spreading for Glauber dynamics of the Ising model near the spreading threshold T-d. Without magnetic field, we find T-d < T-c both in two and three dimensions. For temperatures above T-d there exists a critical magnetic field B-d(T) below which the damage spreads. In all cases the critical behaviour at threshold is consistent with directed percolation.