Groupoid crossed-modules and cohomology

GAP Seminar

Meeting Details

For more information about this meeting, contact Mathieu Stiénon, Nigel Higson, Ping Xu.

Speaker: Jean-Louis Tu, Universite de Lorraine, Metz

Abstract: It is well-known that bundle gerbes on a manifold, possibly endowed with an action of a Lie group, can be defined in terms of central extensions of Lie groupoids, which are classified by a second cohomology group. In this talk, we will explain the analogue for bundle 2-gerbes, and see how the language of groupoids can conveniently explain the existence of a product in equivariant twisted K-theory.

Room Reservation Information

Room Number: 106 McAllister

Date: 08/27/2013

Time: 2:30pm - 3:30pm