Mathematics – Geometric Topology
Scientific paper
2005-02-24
Mathematics
Geometric Topology
33 pages, rearranged and partially rewritten
Scientific paper
We show a non-existence result for some class of equivariant maps between sphere bundles over tori. The notion of equivariant KO-degree is used in the proof. As an application to Seiberg-Witten theory, for a connected closed oriented spin 4-manifold with indefinite intersection form, we have a new bound of the second Betti number by the signature and a non-negative integer determined by the quadruple cup product on the first cohomology group and some maps in KO-theory induced from the Albanese map.
Furuta Mikio
Kametani Yukio
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