Deformation of Delone dynamical systems and pure point diffraction

Details Deformation of Delone dynamical systems and pure point diffraction Deformation of Delone dynamical systems and pure point diffraction

2004-04-07

arxiv.org/abs/math/0404155v2

J. Fourier Anal. Appl. 11 (2005) 125-150.

Mathematics

Dynamical Systems

25 pages; revised version with minor corrections, an extended summary of the topic, and further references

Scientific paper

10.1007/s00041-005-4021-1

This paper deals with certain dynamical systems built from point sets and, more generally, measures on locally compact Abelian groups. These systems arise in the study of quasicrystals and aperiodic order, and important subclasses of them exhibit pure point diffraction spectra. We discuss the relevant framework and recall fundamental results and examples. In particular, we show that pure point diffraction is stable under ``equivariant'' local perturbations and discuss various examples,including deformed model sets. A key step in the proof of stability consists in transforming the problem into a question on factors of dynamical systems.

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