arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.10906math.AG
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非奇异射影曲线割线簇的奇性与合点

Singularities and syzygies of secant varieties of nonsingular projective curves

Lawrence Ein, Wenbo Niu, Jinhyung Park

摘要:

近年来,定义割线簇及其合点的方程引起了人们的广泛关注。本文的目的是通过解决几个问题,揭示奇点与合点之间的相互作用,对曲线割线簇进行深入的研究。主要结果是:对于非负整数$k$和$p$,若亏格为$g$的非奇异曲线的嵌入线丛的次数大于$2g+2k+p$,则曲线的$k$次正割簇具有正规的Du Bois奇点,是算术Cohen-Macaulay,并满足性质$N_{k+2, p}$ .此外,还根据曲线的亏格对割线簇的奇点进行了进一步的分类,并得到了Castelnuovo-Mumford图.作为主要的技术成分之一,我们建立了一个消失定理的笛卡儿积的曲线,这可能有独立的利益,并可能会发现其他地方的应用。

英文摘要:

In recent years, the equations defining secant varieties and their syzygies have attracted considerable attention. The purpose of the present paper is to conduct a thorough study on secant varieties of curves by settling several conjectures and revealing interaction between singularities and syzygies. The main results assert that if the degree of the embedding line bundle of a nonsingular curve of genus $g$ is greater than $2g+2k+p$ for nonnegative integers $k$ and $p$, then the $k$-th secant variety of the curve has normal Du Bois singularities, is arithmetically Cohen--Macaulay, and satisfies the property $N_{k+2, p}$. In addition, the singularities of the secant varieties are further classified according to the genus of the curve, and the Castelnuovo--Mumford regularities are also obtained as well. As one of the main technical ingredients, we establish a vanishing theorem on the Cartesian products of the curve, which may have independent interests and may find applications elsewhere.

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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