Friedrich-Alexander-Universität, Erlangen, Germany
Date(s) : 13/09/2016 iCal
11 h 00 min - 12 h 00 min
Model sets are projections of certain lattice subsets. It was realized by Moody that dynamical properties of such sets are induced from the torus associated with the lattice. We follow and extend this approach by studying dynamics on the graph of the map which associates lattice subsets to points of the torus and then transferring the results to their projections. This not only leads to transparent proofs of known results on model sets, but we also obtain new results on so called weak model sets. In particular we prove pure point dynamical spectrum for the hull of a weak model set together with the push forward of the torus Haar measure under the torus parametrisation map, and we derive a formula for the pattern frequencies of configurations with maximal density.