双星排列和尖顶多网

Yongqiang Liu, Wentao Xie
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引用次数: 0

摘要

让 $\mathcal{A}$ 是复投影空间中的一个超平面排列。$\mathcal{A}$ 的组合学是否决定了一度同调跃迁位置(具有复系数),这是一个悬而未决的问题。根据 Falk 和 Yuzvinsky \cite{FY}的研究,所有通过原点的不可还原成分都是由多网结构决定的,而多网结构是由组合决定的。德纳姆和苏修引入尖多内特结构,以获得在一度同调跃迁位置(the degree one cohomology jump loci \cite{DS})中具有翻译正维成分的排列的例子。Suciu 提出了一个问题:是否所有翻译的正维成分都以这种方式出现?在本文中,我们证明了石桥、菅原和吉永引入的双星排列 (\cite[例 3.2]{ISY22} 给出了这个问题的否定答案。
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Double star arrangement and the pointed multinet
Let $\mathcal{A}$ be a hyperplane arrangement in a complex projective space. It is an open question if the degree one cohomology jump loci (with complex coefficients) are determined by the combinatorics of $\mathcal{A}$. By the work of Falk and Yuzvinsky \cite{FY}, all the irreducible components passing through the origin are determined by the multinet structure, which are combinatorially determined. Denham and Suciu introduced the pointed multinet structure to obtain examples of arrangements with translated positive-dimensional components in the degree one cohomology jump loci \cite{DS}. Suciu asked the question if all translated positive-dimensional components appear in this manner \cite{Suc14}. In this paper, we show that the double star arrangement introduced by Ishibashi, Sugawara and Yoshinaga \cite[Example 3.2]{ISY22} gives a negative answer to this question.
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