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S1-bundles and gerbes over differentiable stacks

Kai Behrend, Ping Xu

math.DGarXiv:math/0306182

Abstract

We study S1-bundles and S1-gerbes over differentiable stacks in terms of Lie groupoids, and construct Chern classes and Dixmier-Douady classes in terms of analogues of connections and curvature.

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