The equivariant index theorem for transversally elliptic operators and the basic index theorem for Riemannian foliations

Details The equivariant index theorem for transversally elliptic operators and the basic index theorem for Riemannian foliations The equivariant index theorem for transversally elliptic operators and the basic index theorem for Riemannian foliations

2010-08-11

arxiv.org/abs/1008.2016v2

Mathematics

Differential Geometry

12 pages, typos corrected, some statements in introduction clarified

Scientific paper

In this expository paper, we explain a formula for the multiplicities of the index of an equivariant transversally elliptic operator on a $G$-manifold. The formula is a sum of integrals over blowups of the strata of the group action and also involves eta invariants of associated elliptic operators. Among the applications is an index formula for basic Dirac operators on Riemannian foliations, a problem that was open for many years. This paper summarizes the work in the papers arXiv:1005.3845 [math.DG] and arXiv:1008.1757 [math.DG].

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