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arXiv 1509.00531math.AG
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半对数典型对的消失定理和半正性定理

Vanishing and semipositivity theorems for semi-log canonical pairs

Osamu Fujino

摘要:

证明了投射半对数标准对的对数多标准丛的直象的一个有效的消灭定理。作为应用,我们得到了曲线上投射半对数标准对的相对对数多标准丛的直象的半正性定理,它蕴涵了稳定簇的模空间的投射性.值得一提的是,我们没有使用(混合)Hodge结构的变分理论。

英文摘要:

We prove an effective vanishing theorem for direct images of log pluricanonical bundles of projective semi-log canonical pairs. As an application, we obtain a semipositivity theorem for direct images of relative log pluricanonical bundles of projective semi-log canonical pairs over curves, which implies the projectivity of the moduli spaces of stable varieties. It is worth mentioning that we do not use the theory of variation of (mixed) Hodge structure.

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