An equivariant index for proper actions II: Properties and applications

  • Peter Hochs

    University of Adelaide, Australia
  • Yanli Song

    Washington University, St. Louis, USA
An equivariant index for proper actions II: Properties and applications cover
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Abstract

In the first part of this series, we defined an equivariant index without assuming the group acting or the orbit space of the action to be compact. This allowed us to generalise an index of deformed Dirac operators, defined for compact groups by Braverman. In this paper, we investigate properties and applications of this index. We prove that it has an induction property that can be used to deduce various other properties of the index. In the case of compact orbit spaces, the index is a special case of Kasparov’s index of transversally elliptic operators. In that case, we show how it is related to the analytic assembly map from the Baum–Connes conjecture, and an index used by Mathai and Zhang. In the case of noncompact orbit spaces, we use the index to define a notion of KK-homological Dirac induction, and show that, under conditions, it satisfies the quantisation commutes with reduction principle.

Cite this article

Peter Hochs, Yanli Song, An equivariant index for proper actions II: Properties and applications. J. Noncommut. Geom. 12 (2018), no. 1, pp. 157–193

DOI 10.4171/JNCG/273