2003/06/11 by Kai Behrend, Ping Xu
Mathematics · Physics and Astronomy · #math.DG #math-ph #math.AG #math.MP
published as published in C. R. Acad. Sci. Paris, Ser. I 336 (2003) 163-168 · 6 pages
arxiv created 2003/06/11 · arxiv updated 2009/11/30
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.