The index of projective families of elliptic operators: the decomposable case

Details The index of projective families of elliptic operators: the decomposable case The index of projective families of elliptic operators: the decomposable case

2008-08-29

arxiv.org/abs/0809.0028v3

Asterisque,328:255-296, 2009

Mathematics

Differential Geometry

37 pages, Latex2e, canonical example included in Appendix C

Scientific paper

An index theory for projective families of elliptic pseudodifferential operators is developed when the twisting, i.e. Dixmier-Douady, class is decomposable. One of the features of this special case is that the corresponding Azumaya bundle can be realized in terms of smoothing operators. The topological and the analytic index of a projective family of elliptic operators both take values in the twisted K-theory of the parameterizing space. The main result is the equality of these two notions of index. The twisted Chern character of the index class is then computed by a variant of Chern-Weil theory.

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