On automorphism groups of low complexity subshifts
| Autor: | Sebastián Donoso, Samuel Petite, Fabien Durand, Alejandro Maass |
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| Rok vydání: | 2015 |
| Předmět: |
Finite group
medicine.medical_specialty Group (mathematics) Applied Mathematics General Mathematics 010102 general mathematics Order (ring theory) Topological dynamics Automorphism 01 natural sciences 010101 applied mathematics Combinatorics Nilpotent medicine 0101 mathematics Word (group theory) Quotient Mathematics |
| Zdroj: | Ergodic Theory and Dynamical Systems. 36:64-95 |
| ISSN: | 1469-4417 0143-3857 |
| DOI: | 10.1017/etds.2015.70 |
| Popis: | In this article, we study the automorphism group$\text{Aut}(X,{\it\sigma})$of subshifts$(X,{\it\sigma})$of low word complexity. In particular, we prove that$\text{Aut}(X,{\it\sigma})$is virtually$\mathbb{Z}$for aperiodic minimal subshifts and certain transitive subshifts with non-superlinear complexity. More precisely, the quotient of this group relative to the one generated by the shift map is a finite group. In addition, we show that any finite group can be obtained in this way. The class considered includes minimal subshifts induced by substitutions, linearly recurrent subshifts and even some subshifts which simultaneously exhibit non-superlinear and superpolynomial complexity along different subsequences. The main technique in this article relies on the study of classical relations among points used in topological dynamics, in particular, asymptotic pairs. Various examples that illustrate the technique developed in this article are provided. In particular, we prove that the group of automorphisms of a$d$-step nilsystem is nilpotent of order$d$and from there we produce minimal subshifts of arbitrarily large polynomial complexity whose automorphism groups are also virtually$\mathbb{Z}$. |
| Databáze: | OpenAIRE |
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