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arXiv 0801.3600math.AGmath.AC
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三次曲面上的ACM丛

ACM bundles on cubic surfaces

Marta Casanellas, Robin Hartshorne

摘要:

本文证明了:对于任意的$r \geq 2$,非奇异三次曲面$X \subset \mathbb{P}^3$上的秩$r$稳定向量丛的模空间$c_2=(3r^2-r)/2$包含由ACM丛构成的非空光滑开子集,即无中间上同调的向量丛.我们考虑的丛是极值的相应模块的生成元的数量(这些被称为乌尔里希丛),所以我们也证明了存在的不可分解的乌尔里希丛的任意高秩$X$。

英文摘要:

In this paper we prove that, for every $r \geq 2$, the moduli space $M^s_X(r;c_1,c_2)$ of rank $r$ stable vector bundles with Chern classes $c_1=rH$ and $c_2=(3r^2-r)/2$ on a nonsingular cubic surface $X \subset \mathbb{P}^3$ contains a nonempty smooth open subset formed by ACM bundles, i.e. vector bundles with no intermediate cohomology. The bundles we consider for this study are extremal for the number of generators of the corresponding module (these are known as Ulrich bundles), so we also prove the existence of indecomposable Ulrich bundles of arbitrarily high rank on $X$.

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