Abstract
In this article we prove a Riemann-Roch-Grothendieck theorem for the characteristic classes of a flat vector bundle over a foliation whose graph is Hausdorff. We assume that the strong foliation Novikov-Shubin invariants of the flat bundle are greater than three times the codimension of the foliation. Using transgression, we define a torsion form which in the odd acyclic case determines a Haefliger cohomology class which only depends on the foliation and the flat bundle. We construct examples where this torsion class is highly non-trivial.
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Heitsch, J.L., Lazarov, C. Riemann-Roch-Grothendieck and torsion for foliations. J Geom Anal 12, 437–468 (2002). https://doi.org/10.1007/BF02922049
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DOI: https://doi.org/10.1007/BF02922049