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- W1622341195 abstract "The Lichnerowicz formula yields an index theoretic obstruction to positive scalar curvature metrics on closed spin manifolds. The most general form of this obstruction is due to Rosenberg and takes values in the K-theory of the group C ∗-algebra of the fundamental group of the underlying manifold.We give an overview of recent results clarifying the relation of the Rosenberg index to notions from large scale geometry like enlargeability and essentialness. One central topic is the concept of K-homology classes of infinite K-area. This notion, which in its original form is due to Gromov, is put in a general context and systematically used as a link between geometrically defined large scale properties and index theoretic considerations. In particular, we prove essentialness and the non-vanishing of the Rosenberg index for manifolds of infinite K-area." @default.
- W1622341195 created "2016-06-24" @default.
- W1622341195 creator A5069612789 @default.
- W1622341195 date "2011-12-15" @default.
- W1622341195 modified "2023-09-28" @default.
- W1622341195 title "Positive Scalar Curvature, K-area and Essentialness" @default.
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- W1622341195 doi "https://doi.org/10.1007/978-3-642-22842-1_10" @default.
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