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arXiv 2107.09424math.DGmath.AT
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具有3个不动点的有向流形上的圆周作用

Circle actions on oriented manifolds with 3 fixed points

Donghoon Jang

AI总结:

研究了具有3个不动点的紧致有向流形上的圆周作用,在各向同性子流形可定向的假设下,证明了8维情形下不动点权重与四元数射影空间作用一致,且不存在此类12维流形。

摘要:

设圆周群作用在具有非空离散不动点集的紧致有向流形$M$上。则$M$的维数为偶数。若$M$有一个不动点,则$M$为点。在任何偶数维中,存在具有两个不动点的此类流形$M$,即偶数维球面的旋转。假设$M$有三个不动点。则$M$的维数是4的倍数。在各向同性子流形均可定向的假设下,我们证明了若$\dim M=8$,则不动点处的权重与四元数射影空间$\mathbb{HP}^2$上的作用权重一致,并证明了不存在这样的12维流形$M$。

英文摘要:

Let the circle group act on a compact oriented manifold $M$ with a non-empty discrete fixed point set. Then the dimension of $M$ is even. If $M$ has one fixed point, $M$ is the point. In any even dimension, such a manifold $M$ with two fixed points exists, a rotation of an even dimensional sphere. Suppose that $M$ has three fixed points. Then the dimension of $M$ is a multiple of 4. Under the assumption that each isotropy submanifold is orientable, we show that if $\dim M=8$, then the weights at the fixed points agree with those of an action on the quaternionic projective space $\mathbb{HP}^2$, and show that there is no such 12-dimensional manifold $M$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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