A relative higher index theorem, diffeomorphisms and positive scalar curvature

Details A relative higher index theorem, diffeomorphisms and positive scalar curvature A relative higher index theorem, diffeomorphisms and positive scalar curvature

2012-04-16

arxiv.org/abs/1204.3664v2

Mathematics

K-Theory and Homology

48 pages, 5 figures

Scientific paper

We prove a relative higher index theorem for complete manifolds with positive scalar curvature towards infinity. We apply this theorem to study Riemannian metrics of positive scalar curvature on manifolds. For every two metrics of positive scalar curvature on a closed manifold and a Galois cover of the manifold, we define a secondary higher index class. Non-vanishing of this higher index class is an obstruction for the two metrics to be in the same connected component of the space of metrics of positive scalar curvature. In the special case where one metric is induced from the other by a diffeomorphism of the manifold, we obtain a formula for computing this higher index class. In particular, it follows that the higher index class lies in the image of the Baum-Connes assembly map.

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