Videos

CAT(0) Cube Complexes and Low Dimensional Cohomology

Presenter
August 18, 2016
Keywords:
  • geometric group theory
  • CAT(0) space
  • cube complex
  • Hilbert space isometries
  • discrete group actions
  • cohomology theory
  • cocycle conditions
MSC:
  • 20F65
  • 20F67
  • 20Fxx
  • 20-xx
  • 37A20
  • 22E40
Abstract
CAT(0) cube complexes are charming objects with many striking properties. For example, they admit two interesting, and naturally coupled metrics: the CAT(0) metric and the median metric, allowing one to access the rich tools from each of those worlds. The study of low dimensional cohomology of a group touches upon several important aspects of group theory: Property (T), the Haagerup Property, stable commutator length, and even superrigidity. In this talk, we will discuss CAT(0) cube complexes, and how they provide a nice framework for finding low dimensional cohomology classes such as the Haagerup Cocycle and various generalization of the Brooks cocycle.
Supplementary Materials