Quasi-isometry and commensurability classification of certain right-angled Coxeter groups
Presenter
September 30, 2016
Keywords:
- non-positive curvature
- CAT(0) space
- symmetric space
- buildings and complexes
- group actions
MSC:
- 57M60
- 57-xx
- 58-xx
- 58Dxx
- 58D05
- 58D19
- 20F55
- 20F34
- 20F29
- 20F65
- 20F69
- 20Fxx
- 20-xx
Abstract
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).