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Spectral theory of $\mathbb{Z}^{d}$ substitutions

Published online by Cambridge University Press:  20 October 2016

ALAN BARTLETT*
Affiliation:
University of Washington Tacoma, Interdisciplinary Arts and Sciences, Box 358436, 1900 Commerce Street, Tacoma, WA 98402, USA email alanmb@math.washington.edu

Abstract

In this paper, we generalize and develop results of Queffélec allowing us to characterize the spectrum of an aperiodic $\mathbb{Z}^{d}$ substitution. Specifically, we describe the Fourier coefficients of mutually singular measures of pure type giving rise to the maximal spectral type of the translation operator on $L^{2}$, without any assumptions on primitivity or height, and show singularity for aperiodic bijective commutative $\mathbb{Z}^{d}$ substitutions. Moreover, we provide a simple algorithm to determine the spectrum of aperiodic $\mathbf{q}$-substitutions, and use this to show singularity of Queffélec’s non-commutative bijective substitution, as well as the Table tiling, answering an open question of Solomyak. Finally, we show that every ergodic matrix of measures on a compact metric space can be diagonalized, which we use in the proof of the main result.

Type
Original Article
Copyright
© Cambridge University Press, 2016 

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