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arXiv · 1211.1553

Applying geometric K-cycles to fractional indices

Robin J. Deeley·Magnus Goffeng
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Abstract

A geometric model for twisted $K$-homology is introduced. It is modeled after the Mathai-Melrose-Singer fractional analytic index theorem in the same way as the Baum-Douglas model of $K$-homology was modeled after the Atiyah-Singer index theorem. A natural transformation from twisted geometric $K$-homology to the new geometric model is constructed. The analytic assembly mapping to analytic twisted $K$-homology in this model is an isomorphism for torsion twists on a finite CW-complex. For a general twist on a smooth manifold the analytic assembly mapping is a surjection. Beyond the aforementioned fractional invariants, we study $T$-duality for geometric cycles.

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Robin J. Deeley, Magnus Goffeng. 2012-11-07. Applying geometric K-cycles to fractional indices. https://arxiv.org/abs/1211.1553

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