Unique ergodicity and uniform density for compact-window model sets

Let (G×H,L)(G\times H,\mathcal{L}) be a cut and project scheme, let WHW\subset H be a compact set, and let \text{\Large \curlywedge}(W) denote the associated model set. Write θH\theta_H for Haar measure on HH, and let dens(Λ)\underline{\operatorname{dens}}(\varLambda) and dens(Λ)\overline{\operatorname{dens}}(\varLambda) denote the lower and upper uniform densities of the model set \varLambda=\text{\Large \curlywedge}(W). Unique ergodicity conjecture. If \text{\Large \curlywedge}(W) is uniquely ergodic, then

θH(W)=dens(Λ)anddens(Λ)=θH(W).\theta_H(W^\circ)=\underline{\operatorname{dens}}(\varLambda)\quad\text{and}\quad\overline{\operatorname{dens}}(\varLambda)=\theta_H(W).

The proposed equalities would characterize the boundary condition θH(W)=0\theta_H(\partial W)=0, which is central to characterizing regular model sets, through uniform density. The statement is motivated by the preceding sharpness example and is presented as a reasonable expectation; no resolution is supplied in the source.

Sources & referencesView supporting material

Primary source

Nicolae Strungaru, “Almost Periodic Measures and Meyer Sets”, arXiv:1501.00945 (2015).

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