arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2602.04038math.AG
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secant varieties 的 Hodge 理论

Hodge theory of secant varieties

University of Michigan(密歇根大学);Stony Brook University(石溪大学);University of Toronto(多伦多大学);University of Arizona(亚利桑那大学)

Qianyu Chen, Bradley Dirks, Sebastian Olano, Debaditya Raychaudhury

AI总结:

本文研究了secant varieties的Hodge理论,探讨了局部cohomology模块的缺陷及其与原始cohomology的关系,并计算了相关Hodge数和结构,同时改进了文献中的结果。

摘要:

我们研究了光滑投影簇 $Y$ 的secant variety 的线的局部cohomology模块以及更高阶的secant varieties 的光滑投影曲线的局部cohomology模块。我们证明在第一种情况下,局部cohomological缺陷与 $Y$ 的原始cohomology相关,在第二种情况下则为0。作为应用,我们计算了它们的(交集)Hodge-Lyubeznik数,其奇异cohomology上的混合Hodge结构,其交集cohomology上的纯Hodge结构,其局部cohomology模块上Hodge filtration的生成级以及它们的$\mathbf Q$-factorial缺陷。作为副产品,我们通过去除限制的正性假设来恢复并改进了文献中的各种结果。

英文摘要:

We study the local cohomology modules for the secant variety of lines of a smooth projective variety $Y$ and for higher secant varieties of smooth projective curves. We show that the local cohomological defect in the first case is related to the primitive cohomology of $Y$, and in the second case it is $0$. As applications, we compute their (intersection) Hodge-Lyubeznik numbers, the mixed Hodge structure on their singular cohomology, the pure Hodge structure on their intersection cohomology, the generating level of the Hodge filtration on their local cohomology modules and their $\mathbf Q$-factoriality defect. As byproducts, we recover and refine various results from the literature by removing restrictive positivity assumptions.

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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