Directed Percolation Phenomena in Asynchronous Elementary Cellular Automata

Cellular automata are discrete dynamical systems that are widely used to model natural systems Classically they are run with perfect synchrony ; i.e., the local rule is applied to each cell at each time step A possible modification of the updating scheme consists in applying the rule with a fixed probability, called the synchrony rate It has been shown in a previous work that varying the synchrony rate continuously could produce a discontinuity in the behaviour of the cellular automaton This works aims at investigating the nature of this change of behaviour using intensive numerical simulations We apply a two-step protocol to show that the phenomenon is a phase transition whose critical exponents are in good agreement with the predicted values of directed percolation.

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