A Loop Space Formulation for Geometric Lifting Problems

Details A Loop Space Formulation for Geometric Lifting Problems A Loop Space Formulation for Geometric Lifting Problems

2010-07-30

arxiv.org/abs/1007.5373v2

J. Aust. Math. Soc. 90, 129-144 (2011)

Mathematics

Differential Geometry

19 pages, v2 is the published version and comes with a few minor changes

Scientific paper

We review and then combine two aspects of the theory of bundle gerbes. The first concerns lifting bundle gerbes and connections on those, developed by Murray and Gomi. Lifting gerbes represent obstructions against extending the structure group of a principal bundle. The second is the transgression of gerbes to loop spaces, initiated by Brylinski and McLaughlin and with recent contributions of the author. Combining these two aspects, we obtain a new formulation of lifting problems in terms of geometry on the loop space. Most prominently, our formulation explains the relation between (complex) spin structures on a Riemannian manifold and orientations of its loop space.

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