The dichotomy spectrum for random dynamical systems and pitchfork bifurcations with additive noise
Callaway, M; Doan, TS; Lamb, JSW; et al.Rasmussen, M
Date: 27 November 2017
Journal
Annales de l'Institut Henri Poincaré, Probabilités et Statistiques
Publisher
Association des Publications de l’Institut Henri Poincaré
Publisher DOI
Abstract
We develop the dichotomy spectrum for random dynamical systems and demonstrate its use in the characterization of pitchfork bifurcations for random dynamical systems with additive noise.
Crauel and Flandoli (J. Dynam. Differential Equations 10 (1998) 259–274) had shown earlier that adding noise to a system with a deterministic ...
We develop the dichotomy spectrum for random dynamical systems and demonstrate its use in the characterization of pitchfork bifurcations for random dynamical systems with additive noise.
Crauel and Flandoli (J. Dynam. Differential Equations 10 (1998) 259–274) had shown earlier that adding noise to a system with a deterministic pitchfork bifurcation yields a unique attracting random equilibrium with negative Lyapunov exponent throughout, thus “destroying” this bifurcation. Indeed, we show that in this example the dynamics before and after the underlying deterministic bifurcation point are topologically equivalent.
However, in apparent paradox to (J. Dynam. Differential Equations 10 (1998) 259–274), we show that there is after all a qualitative change in the random dynamics at the underlying deterministic bifurcation point, characterized by the transition from a hyperbolic to a non-hyperbolic dichotomy spectrum. This breakdown manifests itself also in the loss of uniform attractivity, a loss of experimental observability of the Lyapunov exponent, and a loss of equivalence under uniformly continuous topological conjugacies.
Mathematics and Statistics
Faculty of Environment, Science and Economy
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