English

Markov partitions for toral $\mathbb{Z}^2$-rotations featuring Jeandel-Rao Wang shift and model sets

Dynamical Systems 2021-01-26 v3 Metric Geometry

Abstract

We define a partition P0\mathcal{P}_0 and a Z2\mathbb{Z}^2-rotation (Z2\mathbb{Z}^2-action defined by rotations) on a 2-dimensional torus whose associated symbolic dynamical system is a minimal proper subshift of the Jeandel-Rao aperiodic Wang shift defined by 11 Wang tiles. We define another partition PU\mathcal{P}_\mathcal{U} and a Z2\mathbb{Z}^2-rotation on T2\mathbb{T}^2 whose associated symbolic dynamical system is equal to a minimal and aperiodic Wang shift defined by 19 Wang tiles. This proves that PU\mathcal{P}_\mathcal{U} is a Markov partition for the Z2\mathbb{Z}^2-rotation on T2\mathbb{T}^2. We prove in both cases that the toral Z2\mathbb{Z}^2-rotation is the maximal equicontinuous factor of the minimal subshifts and that the set of fiber cardinalities of the factor map is {1,2,8}\{1,2,8\}. The two minimal subshifts are uniquely ergodic and are isomorphic as measure-preserving dynamical systems to the toral Z2\mathbb{Z}^2-rotations. It provides a construction of these Wang shifts as model sets of 4-to-2 cut and project schemes. A do-it-yourself puzzle is available in the appendix to illustrate the results.

Keywords

Cite

@article{arxiv.1903.06137,
  title  = {Markov partitions for toral $\mathbb{Z}^2$-rotations featuring Jeandel-Rao Wang shift and model sets},
  author = {Sébastien Labbé},
  journal= {arXiv preprint arXiv:1903.06137},
  year   = {2021}
}

Comments

v1:26 pages, 10 figures. v2:32 pages, 13 figures. v3: various small fixes