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Groups of piecewise linear homeomorphisms of flows

Part of: Structure and classification of infinite or finite groups Topological dynamics Special aspects of infinite or finite groups

Published online by Cambridge University Press:  05 October 2020

Nicolás Matte Bon  and
Michele Triestino
Nicolás Matte Bon
Affiliation:
CNRS & Institut Camille Jordan (ICJ, UMR CNRS 5208), Université de Lyon, 43 blvd. du 11 novembre 1918, 69622Villeurbanne, Francemattebon@math.univ-lyon1.fr
Michele Triestino
Affiliation:
Institut de Mathématiques de Bourgogne (IMB, UMR CNRS 5584), Université Bourgogne Franche-Comté, 9 av. Alain Savary, 21000Dijon, Francemichele.triestino@u-bourgogne.fr
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Abstract

To every dynamical system $(X,\varphi )$ over a totally disconnected compact space, we associate a left-orderable group $T(\varphi )$. It is defined as a group of homeomorphisms of the suspension of $(X,\varphi )$ which preserve every orbit of the suspension flow and act by dyadic piecewise linear homeomorphisms in the flow direction. We show that if the system is minimal, the group is simple and, if it is a subshift, then the group is finitely generated. The proofs of these two statements are short and elementary, providing straightforward examples of finitely generated simple left-orderable groups. We show that if the system is minimal, every action of the corresponding group on the circle has a fixed point. These constitute the first examples of finitely generated left-orderable groups with this fixed point property. We show that for every system $(X,\varphi )$, the group $T(\varphi )$ does not have infinite subgroups with Kazhdan's property $(T)$. In addition, we show that for every minimal subshift, the corresponding group is never finitely presentable. Finally, if $(X,\varphi )$ has a dense orbit, then the isomorphism type of the group $T(\varphi )$ is a complete invariant of flow equivalence of the pair $\{\varphi , \varphi ^{-1}\}$.

Keywords

group actions on one-manifoldsorderable groupssimple groupsfinitely generated groupstopological dynamics

MSC classification

Primary: 20F60: Ordered groups 20E32: Simple groups 20F05: Generators, relations, and presentations
Secondary: 37B10: Symbolic dynamics
Type
Research Article
Information
Compositio Mathematica , Volume 156 , Issue 8 , August 2020 , pp. 1595 - 1622
Copyright
Copyright © The Author(s) 2020

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Footnotes

The second author was partially supported by the project ANR Gromeov (ANR-19-CE40-0007) and the project ANER Agroupes (AAP 2019 Région Bourgogne-Franche-Comté).

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