Pure point diffraction implies zero entropy for Delone sets with uniform cluster frequencies

Abstract

Delone sets of finite local complexity in Euclidean space are investigated. We show that such a set has patch counting and topological entropy 0 if it has uniform cluster frequencies and is pure point diffractive. We also note that the patch counting entropy is 0 whenever the repetitivity function satisfies a certain growth restriction.

16 pages; revised and slightly expanded version