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Shift dynamics of the groups of Fibonacci type

  • Kirk McDermott ORCID logo
From the journal Journal of Group Theory

Abstract

We study the shift dynamics of the groups G = G n ( x 0 x m x k - 1 ) of Fibonacci type introduced by Johnson and Mawdesley. The main result concerns the order of the shift automorphism of 𝐺 and determining whether it is an outer automorphism, and we find the latter occurs if and only if 𝐺 is not perfect. A result of Bogley provides that the aspherical presentations determine groups admitting a free shift action by Z n on the nonidentity elements of 𝐺, from which it follows that the shift is an outer automorphism of order 𝑛 when 𝐺 is nontrivial. The focus of this paper is therefore on the non-aspherical cases, which include for example the Fibonacci and Sieradski groups. With few exceptions, the fixed-point and freeness problems for the shift automorphism are solved, in some cases using computational and topological methods.

Acknowledgements

I would like to W. A. Bogley for his many helpful contributions to this work.

  1. Communicated by: Alexander Olshanskii

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Received: 2022-01-03
Revised: 2022-05-06
Published Online: 2022-07-30
Published in Print: 2023-01-01

© 2022 Walter de Gruyter GmbH, Berlin/Boston

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