Videos

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).
Supplementary Materials