Harmonic limits of dynamical systems

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2011, 2011(Special): 1432-1439. doi: 10.3934/proc.2011.2011.1432

Harmonic limits of dynamical systems

1.	Institute of Mathematics, University of Augsburg, 86135 Augsburg, Germany

Received June 2010 Revised June 2011 Published October 2011

Abstract
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In this paper, we analyze the rotational behaviour of dynamical systems, particulary of solutions of ODEs. With rotational behaviour we mean the existence of rotational factor maps, i. e., semi-conjugations to rotations in the complex plane. In order to analyze this kind of rotational behaviour, we introduce harmonic limits lim$_(T\to\infty)1/T\int^T_0 e^(itw)f(\Phi_tx)$dt. We discuss the connection between harmonic limits and rotational factor maps, and some properties of the limits, e. g., existence under the presence of an invariant measure by the Wiener-Wintner Ergodic Theorem. Finally, we look at linear differential equations (autonomous and periodic), and show the connection between the frequencies of the rotational factor maps and the imaginary parts of the eigenvalues of the system matrix (or of the Floquet exponents in the periodic case).

Keywords: rotational behaviour, Dynamical systems, ergodic theory, linear differential equations.

Mathematics Subject Classification: Primary: 37A30; Secondary: 34A30, 34D08.

Citation: Tobias Wichtrey. Harmonic limits of dynamical systems. Conference Publications, 2011, 2011 (Special) : 1432-1439. doi: 10.3934/proc.2011.2011.1432

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