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arXiv 2305.08780math.AG
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A型环面簇的交点同调

Intersection cohomology of type-A toric varieties

Andras Szenes, Olga Trapeznikova

AI总结:

本文研究A型环面簇的交点同调,通过GIT商构造,提出组合模型计算Betti数,并证明交点同调群具有典范乘积结构。

摘要:

A型环面簇可通过关于某个环面作用的GIT商获得,该作用的权重对应于某个$k>1$的群$SL(k)$的根。这些簇出现在各种重要应用中,特别是作为向量丛模空间中层状结构的法锥。本文描述了这些簇及其相关射影簇的交点Betti数。我们为这些数提出了一个优雅的组合模型,并利用Hausel和Sturmfels的工作,证明了相关的交点同调群具有典范的乘积结构。

英文摘要:

Type-A toric varieties may be obtained as GIT quotients with respect to a torus action with weights corresponding to roots of the group $SL(k)$ for some $k>1$. These varieties appear in various important applications, in particular, as normal cones to strata in moduli spaces of vector bundles. In this paper, we describe the intersection Betti numbers of these varieties, and those of some associated projective varieties. We present an elegant combinatorial model for these numbers, and, using the work of Hausel and Sturmfels, we show that the relevant intersection cohomology groups are endowed with a canonical product structure.

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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