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From gauge anomalies to gerbes and gerbal representations

Jouko Mickelsson (Stockholm)

24.09.2009 at 16:15 

The purpose of this talk is to point out connections between recent ideas about the gerbes and gerbal actions (as higher categorical extension of representation theory) and the old discussion in quantum field theory on commutator anomalies, gauge group extensions, and 3-cocycles. The unifying concept is the classical obstruction theory for group extensions as explained in the monograph "Homology" by Saunders Mac Lane.

Arnold Sommerfeld Center
Theresienstrasse 37
Room 348/349