Delay-Coordinate Maps and the Spectra of Koopman Operators View Full Text


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Article Info

DATE

2019-04-02

AUTHORS

Suddhasattwa Das, Dimitrios Giannakis

ABSTRACT

The Koopman operator induced by a dynamical system is inherently linear and provides an alternate method of studying many properties of the system, including attractor reconstruction and forecasting. Koopman eigenfunctions represent the non-mixing component of the dynamics. They factor the dynamics, which can be chaotic, into quasiperiodic rotations on tori. Here, we describe a method through which these eigenfunctions can be obtained from a kernel integral operator, which also annihilates the continuous spectrum. We show that incorporating a large number of delay coordinates in constructing the kernel of that operator results, in the limit of infinitely many delays, in the creation of a map into the point spectrum subspace of the Koopman operator. This enables efficient approximation of Koopman eigenfunctions in systems with pure point or mixed spectra. We illustrate our results with applications to product dynamical systems with mixed spectra. More... »

PAGES

1-39

Journal

TITLE

Journal of Statistical Physics

ISSUE

N/A

VOLUME

N/A

From Grant

  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/s10955-019-02272-w

    DOI

    http://dx.doi.org/10.1007/s10955-019-02272-w

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1113199773


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