Videos

Cubical geometry via hyperbolicity

Presenter
September 28, 2016
Keywords:
  • CAT(0) space
  • Riemannian geometry
  • negative curvature manifolds
  • hyperbolic manifold
  • symmetric space
  • buildings and complexes
MSC:
  • 57M60
  • 57-xx
  • 58-xx
  • 58Dxx
  • 58D05
  • 58D19
  • 32Q45
Abstract
I will discuss a collection of hyperbolic graphs associated to a CAT(0) cube complex and explain how the geometry of the cube complex can be recovered -- up to quasi-isometry -- from its shadows on these graphs. I will explain how this mirrors the Masur-Minsky theory enabling the study of the mapping class group of a surface via projections to curve graphs of subsurfaces. I'll then define "hierarchical hyperbolicity", which is a common generalisation of these two classes of examples, and discuss some applications. This is based on joint work with J. Behrstock and A. Sisto.
Supplementary Materials