Equivariant maps between sphere bundles over tori and KO-degree
Equivariant maps between sphere bundles over tori and KO-degree
复制标题
环面和 KO 度上的球丛之间的等变映射
DOI:
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发表时间:
2005
期刊:
影响因子:
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通讯作者:
Y. Kametani
中科院分区:
文献类型:
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作者:
M. Furuta;Y. Kametani
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.