Abstract
A tiling of \({\mathbb {R}}^d\) is repulsive if no r-patch can repeat arbitrarily close to itself, relative to r. This is a characteristic property of aperiodic order, for a non-repulsive tiling has arbitrarily large locally periodic patterns. We consider a non-periodic, repetitive tiling T of \({\mathbb {R}}^d\), with finite local complexity. From a spectral triple built on the discrete hull \(\varXi \) of T and its Connes distance, we derive two metrics \(d_{\mathrm{sup}}\) and \(d_{\mathrm{inf}}\) on \(\varXi \). We show that T is repulsive if and only if \(d_{\mathrm{sup}}\) and \(d_{\mathrm{inf}}\) are Lipschitz equivalent. This generalises the previous works on subshifts by J. Kellendonk, D. Lenz, and the author.
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Notes
Sometimes also called a puncture, so that one talks about punctured tilings.
See Remark 2.1.
\(L_p\) is locally derived from T, but T might not be locally derived from \(L_p\), nor from L (think for instance of a Wang tiling if one chooses unspecified marker locations).
Closed and open sets.
\(d_{\mathrm{inf}}\) is an ultra-metric, and \(d_{\mathrm{sup}}\) is valued in \([0,+\infty ]\).
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The author would like to thank J. Kellendonk and D. Lenz for useful discussions and their encouragement to publish this work.
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Savinien, J. A Metric Characterisation of Repulsive Tilings. Discrete Comput Geom 54, 705–716 (2015). https://doi.org/10.1007/s00454-015-9719-5
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DOI: https://doi.org/10.1007/s00454-015-9719-5