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arXiv 1311.3232math.AGmath.CV
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对Fujita关于Hodge结构变化的一个问题的回答

Answer to a question by Fujita on Variation of Hodge Structures

Fabrizio Catanese, Michael Dettweiler

摘要:

我们首先提供了藤田的第二定理的证明细节的Kähler纤维空间的曲线,断言的直接图像$V$的相对对偶层分裂为直和$ V = A \oplus Q$,其中$A$是充足的和$Q$是酉平坦的。我们的主要结果然后回答了否定的问题所提出的藤田是否$V$是半样本。事实上,$V$是半样本的当且仅当$Q$与具有有限象的$B$的基本群的表示相关联。我们的例子是基于超几何积分。

英文摘要:

We first provide details for the proof of Fujita's second theorem for Kähler fibre spaces over a curve, asserting that the direct image $V$ of the relative dualizing sheaf splits as the direct sum $ V = A \oplus Q$, where $A$ is ample and $Q$ is unitary flat. Our main result then answers in the negative the question posed by Fujita whether $V$ is semiample. In fact, $V$ is semiample if and only if $Q$ is associated to a representation of the fundamental group of $B$ having finite image. Our examples are based on hypergeometric integrals.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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