Determining functionals for random partial differential equations

Details Determining functionals for random partial differential equations Determining functionals for random partial differential equations

2001-05-28

arxiv.org/abs/nlin/0105062v1

Nonlinear Sciences

Chaotic Dynamics

To appear: Nonlinear Diff Eqns and Applications (NoDEA)

Scientific paper

Determining functionals are tools to describe the finite dimensional long-term dynamics of infinite dimensional dynamical systems. There also exist several applications to infinite dimensional {\em random} dynamical systems. In these applications the convergence condition of the trajectories of an infinite dimensional random dynamical system with respect to a finite set of linear functionals is assumed to be either in mean or exponential with respect to the convergence almost surely. In contrast to these ideas we introduce a convergence concept which is based on the convergence in probability. By this ansatz we get rid of the assumption of exponential convergence. In addition, setting the random terms to zero we obtain usual deterministic results. We apply our results to the 2D Navier - Stokes equations forced by a white noise.

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