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arXiv 1202.4839math.SG
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从一个Reeb轨道到两个

From one Reeb orbit to two

Daniel Cristofaro-Gardiner, Michael Hutchings

摘要:

我们发现,每一个(可能退化)接触形式上的一个封闭的三流形至少有两个嵌入的Reeb轨道。我们还证明了,如果嵌入Reeb轨道的个数为1/2,则它们的辛作用量不都是单个实数的整数倍;如果嵌入Reeb轨道的个数为2,则它们的辛作用量的乘积小于或等于流形的接触体积.证明使用之间的关系的接触量和渐近的辛行动的数量需要代表某些类嵌入式接触的同源性,最近证明了作者和V.拉莫斯。

英文摘要:

We show that every (possibly degenerate) contact form on a closed three-manifold has at least two embedded Reeb orbits. We also show that if there are only finitely many embedded Reeb orbits, then their symplectic actions are not all integer multiples of a single real number; and if there are exactly two embedded Reeb orbits, then the product of their symplectic actions is less than or equal to the contact volume of the manifold. The proofs use a relation between the contact volume and the asymptotics of the amount of symplectic action needed to represent certain classes in embedded contact homology, recently proved by the authors and V. Ramos.

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