Breakdown of universality in transitions to spatiotemporal chaos.
We show that the transition from laminar to active behavior in extended chaotic systems can vary from a continuous transition in the universality class of directed percolation with infinitely many absorbing states to what appears as a first-order transition. The latter occurs when finite lifetime nonchaotic structures, called "solitons," dominate the dynamics. We illustrate this scenario in an extension of the deterministic Chaté-Manneville coupled map lattice model and in a soliton including variant of the stochastic Domany-Kinzel cellular automaton.
Bohr
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Department of Physics, The Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark.
van Hecke
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Mikkelsen
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Ipsen
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