Invariant manifolds as pullback attractors of nonautonomous differential equations

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May 2006, 15(2): 579-596. doi: 10.3934/dcds.2006.15.579

Invariant manifolds as pullback attractors of nonautonomous differential equations

Bernd Aulbach ^1, , Martin Rasmussen ^1, and Stefan Siegmund ^2,

1.	Department of Mathematics, University of Augsburg, D-86135 Augsburg
2.	Department of Mathematics, University of Frankfurt, D-60325 Frankfurt

Received December 2004 Revised October 2005 Published March 2006

Abstract
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We discuss the relationship between invariant manifolds of nonautonomous differential equations and pullback attractors. This relationship is essential, e.g., for the numerical approximation of these manifolds. In the first step, we show that the unstable manifold is the pullback attractor of the differential equation. The main result says that every (hyperbolic or nonhyperbolic) invariant manifold is the pullback attractor of a related system which we construct explicitly using spectral transformations. To illustrate our theorem, we present an application to the Lorenz system and approximate numerically the stable as well as the strong stable manifold of the origin.

Keywords: invariant manifold, pullback attractor, numerical approximation., Nonautonomous differential equation.

Mathematics Subject Classification: 34C30, 34D45, 37B55, 37D10, 65L2.

Citation: Bernd Aulbach, Martin Rasmussen, Stefan Siegmund. Invariant manifolds as pullback attractors of nonautonomous differential equations. Discrete & Continuous Dynamical Systems - A, 2006, 15 (2) : 579-596. doi: 10.3934/dcds.2006.15.579

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