On the Basilica operation
Jan Moritz Petschick
Heinrich-Heine-Universität, Düsseldorf, GermanyKarthika Rajeev
Heinrich-Heine-Universität, Düsseldorf; Universität Bielefeld, Germany
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Abstract
Inspired by the Basilica group , we describe a general construction which allows us to associate to any group of automorphisms of a rooted tree a family of Basilica groups , . For the dyadic odometer , one has . We study which properties of groups acting on rooted trees are preserved under this operation. Introducing some techniques for handling , in case fulfills some branching conditions, we are able to calculate the Hausdorff dimension of the Basilica groups associated to certain -groups and of generalisations of the odometer, . Furthermore, we study the structure of groups of type and prove an analogue of the congruence subgroup property in the case , a prime.
Cite this article
Jan Moritz Petschick, Karthika Rajeev, On the Basilica operation. Groups Geom. Dyn. 17 (2023), no. 1, pp. 331–384
DOI 10.4171/GGD/702