Coherent sets for nonautonomous dynamical systems

Details Coherent sets for nonautonomous dynamical systems Coherent sets for nonautonomous dynamical systems

2009-11-04

arxiv.org/abs/0911.0717v2

Physica D 239 (2010), no. 16, 1527--1541

Mathematics

Dynamical Systems

Scientific paper

10.1016/j.physd.2010.03.009

We describe a mathematical formalism and numerical algorithms for identifying and tracking slowly mixing objects in nonautonomous dynamical systems. In the autonomous setting, such objects are variously known as almost-invariant sets, metastable sets, persistent patterns, or strange eigenmodes, and have proved to be important in a variety of applications. In this current work, we explain how to extend existing autonomous approaches to the nonautonomous setting. We call the new time-dependent slowly mixing objects coherent sets as they represent regions of phase space that disperse very slowly and remain coherent. The new methods are illustrated via detailed examples in both discrete and continuous time.

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