Equivariant gerbes over compact simple Lie groups
Kai Behrend, Ping Xu, Bin Zhang
Abstract
Using groupoid S1-central extensions, we present, for a compact simple Lie group G, an infinite dimensional model of S1-gerbe over the differential stack G/G whose Dixmier-Douady class corresponds to the canonical generator of the equivariant cohomology HG3 (G, Z).
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