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Full box spaces of free groups

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Veröffentlicht/Copyright: 6. Juli 2017

Abstract

In this paper we investigate full box spaces and coarse equivalences between them. We do this in two parts. In part one we compare the full box spaces of free groups on different numbers of generators. In particular, the full box space of a free group Fk is not coarsely equivalent to the full box space of a free group Fd, if d8k+10. In part two we compare fn to the full box spaces of 2-generated groups. In particular, we prove that the full box space of n is not coarsely equivalent to the full box space of any 2-generated group, if n3.


Communicated by Pierre-Emmanuel Caprace


Award Identifier / Grant number: 200021_163417

Funding statement: Supported by grant 200021_163417 of the Swiss National Science Foundation.

Acknowledgements

The author would like to thank Ana Khukhro and Alain Valette for the many useful comments.

References

[1] A. Khukhro, Box spaces, group extensions and coarse embeddings into Hilbert space, J. Funct. Anal. 263 (2012), no. 1, 115–128. 10.1016/j.jfa.2012.04.004Suche in Google Scholar

[2] A. Khukhro and A. Valette, Expanders and box spaces, preprint (2015), https://arxiv.org/abs/1509.01394. 10.1016/j.aim.2017.05.007Suche in Google Scholar

[3] A. Lubotzky and D. Segal, Subgroup Growth, Progr. Math. 212, Birkhäuser, Basel, 2012. Suche in Google Scholar

Received: 2016-8-16
Revised: 2017-5-30
Published Online: 2017-7-6
Published in Print: 2018-1-1

© 2018 Walter de Gruyter GmbH, Berlin/Boston

Heruntergeladen am 10.10.2025 von https://www.degruyterbrill.com/document/doi/10.1515/jgth-2017-0022/html
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