Recoding Lie algebraic subshifts

Ville Salo; Ilkka Törmä

doi:10.3934/dcds.2020307

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2021, Volume 41, Issue 2: 1005-1021. Doi: 10.3934/dcds.2020307

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Recoding Lie algebraic subshifts

Ville Salo and
Ilkka Törmä^,

Department of Mathematics and Statistics, University of Turku, Turku, Finland

^* Corresponding author: Ilkka Törmä
^* Corresponding author: Ilkka Törmä

Ville Salo supported by Academy of Finland grant 2608073211.

Received: November 30, 2019

Revised: May 31, 2020

Early access: August 2020

Published: February 2021

Ilkka Törmä supported by Academy of Finland grant 295095

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Abstract

We study internal Lie algebras in the category of subshifts on a fixed group – or Lie algebraic subshifts for short. We show that if the acting group is virtually polycyclic and the underlying vector space has dense homoclinic points, such subshifts can be recoded to have a cellwise Lie bracket. On the other hand there exist Lie algebraic subshifts (on any finitely-generated non-torsion group) with cellwise vector space operations whose bracket cannot be recoded to be cellwise. We also show that one-dimensional full vector shifts with cellwise vector space operations can support infinitely many compatible Lie brackets even up to automorphisms of the underlying vector shift, and we state the classification problem of such brackets.

From attempts to generalize these results to other acting groups, the following questions arise: Does every f.g. group admit a linear cellular automaton of infinite order? Which groups admit abelian group shifts whose homoclinic group is not generated by finitely many orbits? For the first question, we show that the Grigorchuk group admits such a CA, and for the second we show that the lamplighter group admits such group shifts.

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Mathematics Subject Classification: Primary:37B10;Secondary:17B99, 54H15.

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