The strong Novikov conjecture for low degree cohomology

Details The strong Novikov conjecture for low degree cohomology The strong Novikov conjecture for low degree cohomology

2007-05-17

arxiv.org/abs/0705.2578v1

Geom Dedicata (2008) 135:119-127

Mathematics

K-Theory and Homology

11 pages

Scientific paper

10.1007/s10711-008-9266-9

We show that for each discrete group G, the rational assembly map K_*(BG) \otimes Q \to K_*(C*_{max} G) \otimes \Q is injective on classes dual to the subring generated by cohomology classes of degree at most 2 (identifying rational K-homology and homology via the Chern character). Our result implies homotopy invariance of higher signatures associated to these cohomology classes. This consequence was first established by Connes-Gromov-Moscovici and Mathai. Our approach is based on the construction of flat twisting bundles out of sequences of almost flat bundles as first described in our previous work. In contrast to the argument of Mathai, our approach is independent of (and indeed gives a new proof of) the result of Hilsum-Skandalis on the homotopy invariance of the index of the signature operator twisted with bundles of small curvature.

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