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arXiv math/0512298math.AGmath.AC
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具有大上同调的空间曲线族

Families of space curves with large cohomology

Nadia Chiarli, Silvio Greco, Uwe Nagel

摘要:

研究了具有大上同调的空间曲线。为此,我们引入次极值型曲线。这个类包括所有次极值曲线。基于几何和数值特征的曲线的次极值型,我们表明,如果上同调是“不太小”,那么它们可以参数化的工会两个一般光滑的不可约家庭,其中之一对应的次极值曲线。对于负亏格的曲线,这些族中的每一个族的一般曲线也是Hilbert方案的不可约分支的支撑的光滑点。这两个分量具有相同的(大)维数,并且在余维1的子方案中相遇。

英文摘要:

We investigate space curves with large cohomology. To this end we introduce curves of subextremal type. This class includes all subextremal curves. Based on geometric and numerical characterizations of curves of subextremal type, we show that, if the cohomology is ``not too small,'' then they can be parameterized by the union of two generically smooth irreducible families; one of them corresponds to the subextremal curves. For curves of negative genus, the general curve of each of these families is also a smooth point of the support of an irreducible component of the Hilbert scheme. The two components have the same (large) dimension and meet in a subscheme of codimension one.

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