Abstract. The setting is an ergodic dynamical system (X, µ) whose points are themselves uniformly discrete point sets Λ in some space R d and whose group action is that of translation of these point sets by the vectors of R d . Steven Dworkin's argument relates the diffraction of the typical point sets comprising X to the dynamical spectrum of X. In this paper we look more deeply at this relationship, particularly in the context of point processes.We show that there is an R d -equivariant, isometric embedding, depending on the scattering strengths (weights) that are assigned to the points of Λ ∈ X, that takes theWe examine the image of this embedding and give a number of examples that show how it fails to be surjective. We show that full information on the measure µ is available from the weights and set of all the correlations (that is, the 2-point, 3-point, . . . , correlations) of the typical point set Λ ∈ X.We develop a formalism in the setting of random point measures that includes multi-colour point sets, and arbitrary real-valued weightings for the scattering from the different colour types of points, in the context of Palm measures and weighted versions of them. As an application we give a simple proof of a square-mean version of the Bombieri-Taylor conjecture, and from that we obtain an inequality that gives a quantitative relationship between the autocorrelation, the diffraction, and the ǫ-dual characters of typical element of X. The paper ends with a discussion of the Palm measure in the context of defining pattern frequencies.
Abstract. We show that real model sets with real internal spaces are determined, up to translation and changes of density 0, by their 2-and 3-point correlations. We also show that there exist pairs of real (even 1D) aperiodic model sets with internal spaces that are products of real spaces and finite cyclic groups whose 2-and 3-point correlations are identical but which are not related by either translation or inversion of their windows. All these examples are pure point diffractive.Placed in the context of ergodic uniformly discrete point processes, the result is that real point processes of model sets based on real internal windows are determined by their second and third moments.
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