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arXiv 2103.12207math.AG
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Fano超曲面的有理自同态

Rational endomorphisms of Fano hypersurfaces

Nathan Chen, David Stapleton

摘要:

我们证明了非常一般的复Fano和Calabi-Yau超曲面的有理自同态的度满足一定的同余条件,通过专门化特征p.作为推论,我们证明了非常一般的n维超曲面的度$d\ge 5\lceil (n+3)/6\rceil$不是双有理椭圆纤维化。讨论的一个关键部分是解决混合特征p中一般p-循环覆盖的奇异性。

英文摘要:

We show that the degrees of rational endomorphisms of very general complex Fano and Calabi-Yau hypersurfaces satisfy certain congruence conditions by specializing to characteristic p. As a corollary we show that very general n-dimensional hypersurfaces of degree $d\ge 5\lceil (n+3)/6\rceil$ are not birational to elliptic fibrations. A key part of the argument is to resolve singularities of general p-cyclic covers in mixed characteristic p.

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