Exotic smooth structures on topological fibre bundles I

Details Exotic smooth structures on topological fibre bundles I Exotic smooth structures on topological fibre bundles I

2012-03-09

arxiv.org/abs/1203.2203v3

Mathematics

K-Theory and Homology

v1: This is the revised Appendix from 1011.4653v2, v2: minor revisions of v1, v3: minor revisions, title of paper changed

Scientific paper

When two smooth manifold bundles over the same base are fiberwise tangentially homeomorphic, the difference is measured by a homology class in the total space of the bundle. We call this the relative smooth structure class. Rationally and stably, this is a complete invariant. We give a more or less complete and self-contained exposition of this theory which is a reformulation of some of the results of [7]. An important application is the computation of the Igusa-Klein higher Reidemeister torsion invariants of these exotic smooth structures. Namely, the higher torsion invariant is equal to the Poincar\'e dual of the image of the smooth structure class in the homology of the base. This is proved in the companion paper [11] written by the first two authors.

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