Year: 2024
Type: article
Abstract: In this paper we will present a construction of a CAT(0) cube complex (an infinite cube), on which the uncountable family of Grigorchuk groups $$G_\omega $$ G ω act without bounded orbit. Moreover, if the sequence $$\omega $$ ω does not contain repetition, we prove that the action is proper and faithful. As a consequence of this result, this cube complex is a model for the classifying space of proper actions for all the groups $$G_\omega $$ G ω with $$\omega $$ ω without repetition. This construction works in a general way for any group acting on a set and which admits a commensurated subset. These examples of non-elliptic actions of infinite finitely generated torsion groups on a non-positively curved cube complex contrast to several established fixed-point theorems concerning actions of torsion groups.
Source: Geometriae Dedicata
Author: Grégoire Schneeberger
Institution: University of Geneva
Language: English
Subfield: Geometry and Topology
Field: Mathematics
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $2,890
Award: G5599649393
OpenAlex ID: W4403629270