Amorphic complexity of group actions with applications to quasicrystals

In this article, we define amorphic complexity for actions of locally compact \sigma-compact amenable groups on compact metric spaces. Amorphic complexity, originally introduced for \mathbb {Z}-actions, is a topological invariant which measures the complexity of dynamical systems in the regime of ze...

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Published in:Transactions of the American Mathematical Society 2023-04, Vol.376 (4), p.2395
Main Authors: Fuhrmann, Gabriel, Gröger, Maik, Jäger, Tobias, Kwietniak, Dominik
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Language:English
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Gröger, Maik
Jäger, Tobias
Kwietniak, Dominik
description In this article, we define amorphic complexity for actions of locally compact \sigma-compact amenable groups on compact metric spaces. Amorphic complexity, originally introduced for \mathbb {Z}-actions, is a topological invariant which measures the complexity of dynamical systems in the regime of zero entropy. We show that it is tailor-made to study strictly ergodic group actions with discrete spectrum and continuous eigenfunctions. This class of actions includes, in particular, Delone dynamical systems related to regular model sets obtained via Meyer’s cut and project method. We provide sharp upper bounds on amorphic complexity of such systems. In doing so, we observe an intimate relationship between amorphic complexity and fractal geometry.
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