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arXiv 1105.3102math.AG
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对数正则极化簇族

Families of Log Canonically Polarized Varieties

Ariana Dundon

摘要:

确定曲线上簇族中奇异纤维的数量是Shafarevich猜想的推广,并且对可以出现在相应模栈中的子簇的类型有影响。我们考虑$¶^1$上对数正则极化簇的族,即族$g:(Y,D)\to ¶^1$,其中$D$是有效的snc因子,层$ω_{Y/¶^1}(D)$是$g$ -样本。首先定义了什么是这样一个家庭的纤维是奇异的,我们表明,与某些温和的假设(纤维有有限的自同构群,$\sO_Y(D)$是半样本,和组件的$D$必须避免奇异的纤维轨迹和交叉的纤维横向),这样一个家庭必须是isovarious或包含至少3个奇异纤维。

英文摘要:

Determining the number of singular fibers in a family of varieties over a curve is a generalization of Shafarevich's Conjecture and has implications for the types of subvarieties that can appear in the corresponding moduli stack. We consider families of log canonically polarized varieties over $¶^1$, i.e. families $g:(Y,D)\to ¶^1$ where $D$ is an effective snc divisor and the sheaf $ω_{Y/¶^1}(D)$ is $g$-ample. After first defining what it means for fibers of such a family to be singular, we show that with the addition of certain mild hypotheses (the fibers have finite automorphism group, $\sO_Y(D)$ is semi-ample, and the components of $D$ must avoid the singular locus of the fibers and intersect the fibers transversely), such a family must either be isotrivial or contain at least 3 singular fibers.

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