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arXiv 1406.2986math.GTmath.AT
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4-流形中的循环群作用与嵌入球面

Cyclic group actions and embedded spheres in 4-manifolds

M. J. D. Hamilton

摘要:

本文给出了单连通4-流形上素数阶光滑同调平凡循环群作用的不动点集中2-球面个数的一个上界。这改进了由4-流形的欧拉示性数的一半给出的先验界。结果还表明,在某些情况下,4-流形根本不允许这样的作用,或任何这样的作用必须是伪自由的。

英文摘要:

In this note we derive an upper bound on the number of 2-spheres in the fixed point set of a smooth and homologically trivial cyclic group action of prime order on a simply-connected 4-manifold. This improves the a priori bound which is given by one half of the Euler characteristic of the 4-manifold. The result also shows that in some cases the 4-manifold does not admit such actions of a certain order at all or that any such action has to be pseudofree.

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