Invariant manifold reduction for stochastic dynamical systems

Details Invariant manifold reduction for stochastic dynamical systems Invariant manifold reduction for stochastic dynamical systems

2006-07-15

arxiv.org/abs/math/0607366v1

Mathematics

Dynamical Systems

Scientific paper

Invariant manifolds facilitate the understanding of nonlinear stochastic dynamics. When an invariant manifold is represented approximately by a graph for example, the whole stochastic dynamical system may be reduced or restricted to this manifold. This reduced system may provide valuable dynamical information for the original system. The authors have derived an invariant manifold reduction or restriction principle for systems of Stratonovich or Ito stochastic differential equations. Two concepts of invariance are considered for invariant manifolds. The first invariance concept is in the framework of cocycles -- an invariant manifold being a random set. The dynamical reduction is achieved by investigating random center manifolds. The second invariance concept is in the sense of almost sure -- an invariant manifold being a deterministic set which is not necessarily attracting. The restriction of the original stochastic system on this deterministic local invariant manifold is still a stochastic system but with reduced dimension.

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