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arXiv 1208.4587math.GTmath-phmath.ATmath.MP
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同伦Brunnian环与$κ$ -不变量

Homotopy Brunnian links and the $κ$-invariant

Frederick R. Cohen, Rafal Komendarczyk, Clayton Shonkwiler

摘要:

我们提供了一个替代的证明,Koschorke的$κ$ -不变量是单射的一组链接同伦类的$n$ -组件同伦Brunnian链接$BLM(n)$。现有的证明(由Koschorke \cite{Koschorke97})是基于庞特里亚金-托姆的框架配边理论,而我们的精神更接近于基于Habegger和Lin的弦链接的技术。我们框架的语言福克斯环面同伦群和有理同伦李代数的配置空间$\text{Conf}(n)$的$n$点在$\mathbb{R}^3$的结果。它允许我们表达相关的米尔诺尔的$μ$ -不变量作为同伦周期的$\text{Conf}(n)$。

英文摘要:

We provide an alternative proof that Koschorke's $κ$-invariant is injective on the set of link homotopy classes of $n$-component homotopy Brunnian links $BLM(n)$. The existing proof (by Koschorke \cite{Koschorke97}) is based on the Pontryagin--Thom theory of framed cobordisms, whereas ours is closer in spirit to techniques based on Habegger and Lin's string links. We frame the result in the language of Fox's torus homotopy groups and the rational homotopy Lie algebra of the configuration space $\text{Conf}(n)$ of $n$ points in $\mathbb{R}^3$. It allows us to express the relevant Milnor's $μ$--invariants as homotopy periods of $\text{Conf}(n)$.

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