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arXiv 0811.3838math.AG
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Brill-Noether理论和K3-surfaces的P^r涡卷

P^r-scrolls arising from Brill-Noether theory and K3-surfaces

Flaminio Flamini

摘要:

本文研究了亏格为g的极化K3曲面S上的P^r-涡卷的例子,这些例子来自S上的原始线性系中一般曲线的Brill-Noether理论和经典的Lazarsfeld的结果.我们证明了这样的涡卷构成了它们的Hilbert格式的一个分量H的开稠密子集,并且研究了H的一些性质(如光滑性、维数计算等).仅根据这类K3的模空间和S上给定Mukai-向量的半稳定无挠层的模空间。本文的动机之一是试图引入射影几何和退化技巧,以研究一般K ~ 3上任意秩的半稳定向量丛的可能极限以及向量丛在射影曲线适当退化上的Brill-Noether理论。最后讨论了基曲线具有一般模的直纹曲面的Hilbert格式的一些应用。

英文摘要:

In this paper we study examples of P^r-scrolls defined over primitively polarized K3 surfaces S of genus g, which arise from Brill-Noether theory of the general curve in the primitive linear system on S and from classical Lazarsfeld's results in. We show that such scrolls form an open dense subset of a component H of their Hilbert scheme; moreover, we study some properties of H (e.g. smoothness, dimensional computation, etc.) just in terms of the moduli space of such K3's and of the moduli space of semistable torsion-free sheaves of a given Mukai-vector on S. One of the motivation of this analysis is to try to introducing the use of projective geometry and degeneration techniques in order to studying possible limits of semistable vector-bundles of any rank on a general K3 as well as Brill-Noether theory of vector-bundles on suitable degenerations of projective curves. We conclude the paper by discussing some applications to the Hilbert schemes of geometrically ruled surfaces whose base curve has general moduli.

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