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arXiv 0706.0675math.SGmath.AG
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哈密顿S^1流形是单圆的

Hamiltonian S^1 manifolds are uniruled

Dusa McDuff

摘要:

本文的主要结果是:每一个闭Hamilton S^1流形都是非圆化的,即它有一个非零的Gromov-Witten不变量,其中一个约束是一个点。证明中使用了M的小量子同调中哈密顿群π_1的Seidel表示以及Hu,Li和Ruan最近提出的blow-up技巧。它适用于更普遍的流形,有一个回路的哈密尔顿辛同胚与非退化固定的最大值。一些后果的阻碍几何进行了探讨。附录讨论了非圆流形的量子同调环的结构。

英文摘要:

The main result of this note is that every closed Hamiltonian S^1 manifold is uniruled, i.e. it has a nonzero Gromov--Witten invariant one of whose constraints is a point. The proof uses the Seidel representation of π_1 of the Hamiltonian group in the small quantum homology of M as well as the blow up technique recently introduced by Hu, Li and Ruan. It applies more generally to manifolds that have a loop of Hamiltonian symplectomorphisms with a nondegenerate fixed maximum. Some consequences for Hofer geometry are explored. An appendix discusses the structure of the quantum homology ring of uniruled manifolds.

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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