Synchronization transition in space-time chaos in the presence of quenched disorder

Abstract

Synchronization of two replicas of coupled map lattices for continuous maps is known to be in the multiplicative noise universality class. We study this transition in the presence of quenched disorder in coupling. The disorder is identical in both replicas. We study one-dimensional, two-dimensional, and globally coupled logistic and tent maps. We observe a clear second-order transition with new exponents. The order parameter decays as $t^{-\delta}$ and $\delta$ depends on the map and its parameters. The asymptotic order parameter for $\Delta$ distance from a critical point grows as $\Delta^{\beta}$ with $\beta=\delta$. The quenched disorder in coupling is a relevant perturbation for the replica synchronization of coupled map lattices. The critical exponents are different from those of the multiplicative noise universality class. However, it does not depend on dimensionality if the transition is continuous for the cases studied.