English

Schreier graphs of the Basilica group

Group Theory 2015-03-13 v5 Dynamical Systems

Abstract

With any self-similar action of a finitely generated group GG of automorphisms of a regular rooted tree TT can be naturally associated an infinite sequence of finite graphs {Γn}n1\{\Gamma_n\}_{n\geq 1}, where Γn\Gamma_n is the Schreier graph of the action of GG on the nn-th level of TT. Moreover, the action of GG on T\partial T gives rise to orbital Schreier graphs Γξ\Gamma_{\xi}, ξT\xi\in \partial T. Denoting by ξn\xi_n the prefix of length nn of the infinite ray ξ\xi, the rooted graph (Γξ,ξ)(\Gamma_{\xi},\xi) is then the limit of the sequence of finite rooted graphs {(Γn,ξn)}n1\{(\Gamma_n,\xi_n)\}_{n\geq 1} in the sense of pointed Gromov-Hausdorff convergence. In this paper, we give a complete classification (up to isomorphism) of the limit graphs (Γξ,ξ)(\Gamma_{\xi},\xi) associated with the Basilica group acting on the binary tree, in terms of the infinite binary sequence ξ\xi.

Keywords

Cite

@article{arxiv.0911.2915,
  title  = {Schreier graphs of the Basilica group},
  author = {Daniele D'Angeli and Alfredo Donno and Michel Matter and Tatiana Nagnibeda},
  journal= {arXiv preprint arXiv:0911.2915},
  year   = {2015}
}

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32 pages