Abstract
We find sufficient conditions for the singularity of a substitution \(\mathbb {Z}\)-action’s spectrum, which generalize a result of Bufetov and Solomyak, and we also obtain a similar statement for a collection of substitution \(\mathbb {R}\)-actions, including the self-similar one. To achieve this, we first study the distribution of related toral endomorphism orbits. In particular, given a toral endomorphism and a vector \(\textbf{v}\in \mathbb {Q}^d\), we find necessary and sufficient conditions for the orbit of \(\omega \textbf{v}\) to be uniformly distributed modulo 1 for almost every \(\omega \in \mathbb {R}\). We use our results to find new examples of singular substitution \(\mathbb {Z}\)- and \(\mathbb {R}\)-actions.
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Acknowledgements
The author is grateful to Boris Solomyak for many helpful ideas, suggestions and comments. This research is a part of the author’s master’s thesis (in preparation) at the Bar-Ilan University under the direction of B. Solomyak and was supported in part by the Israel Science Foundation grant 911/19 (PI B. Solomyak).
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Yaari, R. Uniformly distributed orbits in \(\mathbb {T}^d\) and singular substitution dynamical systems. Monatsh Math 201, 289–306 (2023). https://doi.org/10.1007/s00605-023-01829-y
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DOI: https://doi.org/10.1007/s00605-023-01829-y