Damage-spreading in the parallel Bak-Sneppen model

We study the behavior under perturbations of the Parallel Bak-Sneppen model (PBS) in 1 + 1 dimension, which has been shown to belong to the universali ty class of Directed Percolation (DP) in 1+1 dimensions [1]. We focus our a ttention on the damage-spreading features of the PBS model with both random and deterministic updating, which are studied and compared to the known re sults for the extremal Bak-Sneppen model (BS) and for DP. For both random a nd deterministic updating, we observe a power law growth of the Hamming dis tance. In addition, we compute analytically the asymptotic plateau reached by the distance after the growing phase.