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arXiv math/9805140math.AG
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射影K3曲面上的平滑曲线

Smooth curves on projective K3 surfaces

Andreas Leopold Knutsen

摘要:

本文对所有的$n \geq 2$,d>0,给出了(X,C)存在的充要条件,其中X是$g \geq 0$中的2n次K3曲面,C是X上亏格为g的d次光滑(约化和不可约)曲线.构造的表面有皮卡德组的最小秩可能(1或2),在每种情况下,我们指定一组发电机。对于$n \geq 4$,我们还确定何时可以选择X作为二次曲面的交集(在所有其他情况下,X必须是二次曲面和三次曲面的交集)。最后,对任意整数$k \geq 1$,给出了$Ø_C (k)$非特殊的充要条件.

英文摘要:

In this paper we give for all $n \geq 2$, d>0, $g \geq 0$ necessary and sufficient conditions for the existence of a pair (X,C), where X is a K3 surface of degree 2n in $\matbf{P}^{n+1}$ and C is a smooth (reduced and irreducible) curve of degree d and genus g on X. The surfaces constructed have Picard group of minimal rank possible (being either 1 or 2), and in each case we specify a set of generators. For $n \geq 4$ we also determine when X can be chosen to be an intersection of quadrics (in all other cases X has to be an intersection of both quadrics and cubics). Finally, we give necessary and sufficient conditions for $Ø_C (k)$ to be non-special, for any integer $k \geq 1$.

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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