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An autocorrelation and a discrete spectrum for dynamical systems on metric spaces

Part of: Measure-theoretic ergodic theory Ergodic theory

Published online by Cambridge University Press:  27 November 2019

DANIEL LENZ
DANIEL LENZ*
Affiliation:
Mathematisches Institut, Friedrich Schiller Universität Jena, D-03477Jena, Germany email daniel.lenz@uni-jena.de
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Abstract

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We study dynamical systems $(X,G,m)$ with a compact metric space $X$, a locally compact, $\unicode[STIX]{x1D70E}$-compact, abelian group $G$ and an invariant Borel probability measure $m$ on $X$. We show that such a system has a discrete spectrum if and only if a certain space average over the metric is a Bohr almost periodic function. In this way, this average over the metric plays, for general dynamical systems, a similar role to that of the autocorrelation measure in the study of aperiodic order for special dynamical systems based on point sets.

Keywords

classical ergodic theorygroup actionstopological dynamics

MSC classification

Primary: 28D05: Measure-preserving transformations
Secondary: 37A35: Entropy and other invariants, isomorphism, classification
Type
Original Article
Information
Ergodic Theory and Dynamical Systems , Volume 41 , Issue 3 , March 2021 , pp. 906 - 922
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Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
© Cambridge University Press, 2019

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