Exotic smooth structures on topological fibre bundles II
Abstract
We use a variation of a classical construction of A. Hatcher to construct virtually all stable exotic smooth structures on compact smooth manifold bundles whose fibers have sufficiently large odd dimension (at least twice the base dimension plus 3). Using a variation of the Dwyer-Weiss-Williams smoothing theory which we explain in a separate joint paper with Bruce Williams [11], we associate a homology class in the total space of the bundle to each exotic smooth structure and we show that the image of this class in the homology of the base is the Poincar\'e dual of the relative higher Igusa-Klein (IK) torsion invariant. This answers the question, in the relative case, of which cohomology classes can occur as relative higher torsion classes.
Keywords
Cite
@article{arxiv.1011.4653,
title = {Exotic smooth structures on topological fibre bundles II},
author = {Sebastian Goette and Kiyoshi Igusa},
journal= {arXiv preprint arXiv:1011.4653},
year = {2012}
}
Comments
41 pages, 10 figures. v3 has major improvements in exposition, following referee's report. Appendices have been extracted into a separate joint paper with Bruce Williams. v4: minor revision, title of paper changed