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arXiv 2004.04624math.GT
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经典纽结的更多1-上圈

More 1-cocycles for classical knots

Thomas Fiedler

摘要:

设$M^{reg}$是长纽结直到正则合痕的拓扑模空间,对于任意自然数$n > 1$,$M^{reg}_n$是所有n-带框架长纽结的索的模空间,这些长纽结被一根弦链扭到实心环面$V^3$上.我们通过一个非常简单的公式将纽结的Vassiliev不变量$v_2$提升为$M^{reg}_n$的整数值组合1-上循环。这个1-上循环依赖于一个自然数$a \in \mathbb{Z}\cong H_1(V^3;\mathbb{Z})$,其中以$0<a<n$为参数,通过对该参数取拉格朗日插值多项式,我们得到了一个多项式值的1-上循环。我们发现,它诱导一个非平凡的配对$H_0(M^{reg}_n) \times H_0(M^{reg})$已经为$n=2$。

英文摘要:

Let $M^{reg}$ be the topological moduli space of long knots up to regular isotopy, and for any natural number $n > 1$ let $M^{reg}_n$ be the moduli space of all n-cables of framed long knots which are twisted by a string link to a knot in the solid torus $V^3$ . We upgrade the Vassiliev invariant $v_2$ of a knot to an integer valued combinatorial 1-cocycle for $M^{reg}_n$ by a very simple formula. This 1-cocycle depends on a natural number $a \in \mathbb{Z}\cong H_1(V^3;\mathbb{Z})$ with $0<a<n$ as a parameter and we obtain a polynomial-valued 1-cocycle by taking the Lagrange interpolation polynomial with respect to the parameter. We show that it induces a non-trivial pairing on $H_0(M^{reg}_n) \times H_0(M^{reg})$ already for $n=2$.

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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