Authors: JeanBaptiste Gouéré
Publish Date: 2005/02/18
Volume: 255, Issue: 3, Pages: 655-681
Abstract
We give in this paper topological and dynamical characterizations of mathematical quasicrystals Let Open image in new window denote the space of uniformly discrete subsets of the Euclidean space Let Open image in new window denote the elements of Open image in new window that admit an autocorrelation measure A Patterson set is an element of Open image in new window such that the Fourier transform of its autocorrelation measure is discrete Patterson sets are mathematical idealizations of quasicrystals We prove that S ∈ Open image in new window is a Patterson set if and only if S is almost periodic in Open image in new window Open image in new window where Open image in new window denotes the Besicovitch topology Let χ be an ergodic random element of Open image in new window We prove that χ is almost surely a Patterson set if and only if the dynamical system has a discrete spectrum As an illustration we study deformed model sets
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