Quasi-isometry and commensurability classification of certain right-angled Coxeter groups
Groups acting on CAT(0) spaces September 27, 2016 - September 30, 2016
Location: SLMath: Eisenbud Auditorium
non-positive curvature
CAT(0) space
Symmetric space
buildings and complexes
group actions
54C40 - Algebraic properties of function spaces in general topology [See also 46Exx]
01-11 - Research data for problems pertaining to history and biography
55R35 - Classifying spaces of groups and $H$H-spaces in algebraic topology
20C05 - Group rings of finite groups and their modules (group-theoretic aspects) [See also 16S34]
20Jxx - Connections of group theory with homological algebra and category theory
00A35 - Methodology of mathematics {For mathematics education, see 97-XX}
14622
Bowditch's JSJ tree is a quasi-isometry invariant for one-ended hyperbolic groups, which uses the local cut point structure of their visual boundary. We compute this tree for a large family of hyperbolic right-angled Coxeter groups, and identify a subfamily for which this tree is a complete quasi-isometry invariant. We then investigate the commensurability classification of groups in this subfamily. For our work on commensurability, a key step is proving that these Coxeter groups are virtually geometric amalgams of surfaces. This is joint work with Pallavi Dani (Louisiana State University) and Emily Stark (University of Haifa).
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14622
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