Contact homology and one parameter families of Legendrian knots

Contact homology and one parameter families of Legendrian knots
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勒让德结的接触同调性和一参数族

DOI:
10.2140/gt.2005.9.2013
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发表时间:
2004
影响因子:
2
通讯作者:
T. Kalmán
T. Kalmán
中科院分区:
数学1区
文献类型:
--
作者:
T. Kalmán

文献摘要

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我们考虑标准接触R3中Legendrian纽结的S1-族.我们定义这样的循环,这是一个自同构的Chekanov-Eliashberg接触同调的开始(和结束)点的单值。我们证明了这种单值性是回路的同伦不变量(定理1.1)。我们还建立了技术来解决的问题Reidemeister移动拉格朗日投影的Legendrian链接。作为应用,我们给出了一个右手勒让德环面纽结的环,它在勒让德纽结的Leg(S1,R3)空间中是不可收缩的,但在光滑纽结的Emb(S1,R3)空间中是可收缩的.对于这个结果,我们还计算了我们称之为正辫的勒让德闭包的接触同调(定义6.1),并为每个这样的链接图构造了一个增广。
We consider S 1 -families of Legendrian knots in the standard contact R 3 . We define the monodromy of such a loop, which is an automorphism of the Chekanov-Eliashberg contact homology of the starting (and ending) point. We prove this monodromy is a homotopy invariant of the loop (Theorem 1.1). We also establish techniques to address the issue of Reidemeister moves of Lagrangian projections of Legendrian links. As an application, we exhibit a loop of right-handed Legendrian torus knots which is non-contractible in the space Leg(S 1 , R 3 ) of Legendrian knots, although it is contractible in the space Emb(S 1 ,R 3 ) of smooth knots. For this result, we also compute the contact homology of what we call the Legendrian closure of a positive braid (Definition 6.1) and construct an augmentation for each such link diagram.