Principal Bundles and the Dixmier Douady Class
Alan L. Carey, Diarmuid Crowley, Michael K. Murray
Abstract
A systematic consideration of the problem of the reduction and extension of the structure group of a principal bundle is made and a variety of techniques in each case are explored and related to one another. We apply these to the study of the Dixmier-Douady class in various contexts including string structures, U-res bundles and other examples motivated by considerations from quantum field theory.
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