CAT(0) Cube Complexes and Low Dimensional Cohomology
Connections for Women: Geometric Group Theory August 17, 2016 - August 19, 2016
Location: MSRI: Simons Auditorium
geometric group theory
Hilbert space isometries
discrete group actions
20F65 - Geometric group theory [See also 05C25, 20E08, 57Mxx]
37A20 - Orbit equivalence, cocycles, ergodic equivalence relations
22E40 - Discrete subgroups of Lie groups [See also 20Hxx, 32Nxx]
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.
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