Subshifts and colorings on ascending HNN-extensions of finitely generated abelian groups - Département des mathématiques et applications de l'ENS PARIS Accéder directement au contenu
Article Dans Une Revue Ergodic Theory and Dynamical Systems Année : 2021

Subshifts and colorings on ascending HNN-extensions of finitely generated abelian groups

Résumé

For an ascending HNN-extension $G*_{\psi}$ of a finitely generated abelian group $G$, we study how a synchronization between the geometry of the group and weak periodicity of a configuration in $\mathcal{A}^{G*_{\psi}}$ forces global constraints on it, as well as in subshifts containing it. A particular case are Baumslag-Solitar groups $\mathrm{BS}(1,N)$, $N\ge2$, for which our results imply that a $\mathrm{BS}(1,N)$-SFT which contains a configuration with period $a^{N^\ell}$, $\ell\ge 0$, must contain a strongly periodic configuration with monochromatic $\mathbb{Z}$-sections. Then we study proper $n$-colorings, $n\ge 3$, of the (right) Cayley graph of $\mathrm{BS}(1,N)$, estimating the entropy of the associated subshift together with its mixing properties. We prove that $\mathrm{BS}(1,N)$ admits a frozen $n$-coloring if and only if $n=3$. We finally suggest generalizations of the latter results to $n$-colorings of ascending HNN-extensions of finitely generated abelian groups.

Dates et versions

hal-03958850 , version 1 (26-01-2023)

Identifiants

Citer

Eduardo Silva. Subshifts and colorings on ascending HNN-extensions of finitely generated abelian groups. Ergodic Theory and Dynamical Systems, 2021, 42 (12), pp.3792-3817. ⟨10.1017/etds.2021.95⟩. ⟨hal-03958850⟩
2 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More