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arXiv 2004.08106math.DSmath.SG
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Reeb轨道迫使拓扑熵

Reeb orbits that force topological entropy

Marcelo R. R. Alves, Abror Pirnapasov

摘要:

本文发展了$3$维Reeb流的拓扑熵强迫理论。如果$(Y,ξ)$允许拓扑熵为零的Reeb流,并且$(Y,ξ)$上的每个将$L$实现为周期Reeb轨道集的Reeb流都具有正的拓扑熵,则称闭接触$3$ -流形$(Y,ξ)$中的横链$L$强制拓扑熵.我们的主要结果建立拓扑条件上的横向链接$L$这意味着$L$部队拓扑熵。这些条件是制定在两个Floer理论不变量:圆柱形的接触同源性的补充的横向链接由Momin介绍,和带Legendrian接触同源性的补充的横向链接。然后,我们使用这些结果表明,在每一个封闭的接触$3$ -流形,承认一个Reeb流与消失的拓扑熵,存在横向结,迫使拓扑熵。

英文摘要:

We develop a forcing theory of topological entropy for Reeb flows in dimension $3$. A transverse link $L$ in a closed contact $3$-manifold $(Y,ξ)$ is said to force topological entropy if $(Y,ξ)$ admits a Reeb flow with vanishing topological entropy, and every Reeb flow on $(Y,ξ)$ realizing $L$ as a set of periodic Reeb orbits has positive topological entropy. Our main results establish topological conditions on a transverse link $L$ which imply that $L$ forces topological entropy. These conditions are formulated in terms of two Floer theoretical invariants: the cylindrical contact homology on the complement of transverse links introduced by Momin, and the strip Legendrian contact homology on the complement of transverse links. We then use these results to show that on every closed contact $3$-manifold that admits a Reeb flow with vanishing topological entropy, there exists transverse knots that force topological entropy.

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