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arXiv 2101.09684math.AG
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关于曲线的Hilbert格式的某些分支

On some components of Hilbert schemes of curves

Flaminio Flamini, Paola Supino

摘要:

设$\mathcal{I}_{d,g,R}$是Hilbert格式的不可约分支的并集,其一般点参数化了射影空间$\mathbb{P}^R$中的非退化的光滑不可约次数曲线$d$,亏格$g$.在对$d$,$g$和$R$的一些数值假设下,我们构造了$\mathcal{I}_{d,g,R}$的不可约分支,而不是所谓的{ \em杰出分支},控制光滑亏格-- $g$曲线的模空间$\mathcal{M}_g$,这些曲线是一般光滑的,并且维数比期望的高.任何这样的分量的一般点对应于曲线$X \subset \mathbb{P}^R$,它是无理曲线$Y \subset \mathbb{P}^{R-1}$,$m \geqslant 2$的适当分支$m$-覆盖,位于$Y$上的曲面锥中。本文推广了Y.崔,H。Iliev,S. Kim(参见[12,13]在参考书目中)。

英文摘要:

Let $\mathcal{I}_{d,g,R}$ be the union of irreducible components of the Hilbert scheme whose general points parametrize smooth, irreducible, curves of degree $d$, genus $g$, which are non--degenerate in the projective space $\mathbb{P}^R$. Under some numerical assumptions on $d$, $g$ and $R$, we construct irreducible components of $\mathcal{I}_{d,g,R}$ other than the so-called {\em distinguished component}, dominating the moduli space $\mathcal{M}_g$ of smooth genus--$g$ curves, which are generically smooth and turn out to be of dimension higher than the expected one. The general point of any such a component corresponds to a curve $X \subset \mathbb{P}^R$ which is a suitable ramified $m$--cover of an irrational curve $Y \subset \mathbb{P}^{R-1}$, $m \geqslant 2$, lying in a surface cone over $Y$. The paper extends some of the results in previous papers of Y. Choi, H. Iliev, S. Kim (cf. [12,13] in Bibliography).

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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