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arXiv 1502.07378math.AG
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K3曲面节点曲线的模量

Moduli of nodal curves on K3 surfaces

Ciro Ciliberto, Flaminio Flamini, Concettina Galati, Andreas Leopold Knutsen

摘要:

我们考虑一般$K3$曲面上节点曲线的模性质。设$\mathcal{K}_p$是亏格为$p\geqslant 3$的极化$K3$曲面的模空间$(S,L)$,$\mathcal{V}_{p,m,δ}\to \mathcal{K}_p$是$δ$的泛Severi簇--$(S,L)\in \mathcal{K}_p$上的$|mL|$中的节不可约曲线.我们发现$p, m,δ$上的一个不可约组件$\mathcal{V}$的$\mathcal{V}_{p,m,δ}$上的模映射$ψ: \mathcal{V}\to \mathcal{M}_g$(与$g= m^2 (p -1) + 1-δ$)有一般最大秩微分的存在条件。我们的结果,对任何$p$只留下100%的情况下未解决的,是最佳的$m\geqslant 5$(除了非常低的$p$值),总结在定理1.1中的介绍。

英文摘要:

We consider modular properties of nodal curves on general $K3$ surfaces. Let $\mathcal{K}_p$ be the moduli space of primitively polarized $K3$ surfaces $(S,L)$ of genus $p\geqslant 3$ and $\mathcal{V}_{p,m,δ}\to \mathcal{K}_p$ be the universal Severi variety of $δ$--nodal irreducible curves in $|mL|$ on $(S,L)\in \mathcal{K}_p$. We find conditions on $p, m,δ$ for the existence of an irreducible component $\mathcal{V}$ of $\mathcal{V}_{p,m,δ}$ on which the moduli map $ψ: \mathcal{V}\to \mathcal{M}_g$ (with $g= m^2 (p -1) + 1-δ$) has generically maximal rank differential. Our results, which for any $p$ leave only finitely many cases unsolved and are optimal for $m\geqslant 5$ (except for very low values of $p$), are summarized in Theorem 1.1 in the introduction.

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