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arXiv 1407.7261math.AG
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关于三次超曲面的泛$CH_0$群

On the universal $CH_0$ group of cubic hypersurfaces

Claire Voisin

摘要:

本文研究了光滑三次超曲面的对角线的Chow-理论分解的存在性,或者等价地,研究了光滑三次超曲面的${\rm CH}_0$ -群的泛平凡性.我们证明,奇维立方超曲面或立方fourfolds,这是等价于存在的上同调分解的对角线,我们几何翻译这最后一个条件。对于三次三重$X$,这证明等价于中间雅可比矩阵$J(X)$的最小类$θ^4/4!$的代数性。在维数$4$下,证明了一个特殊的判别式不能被$4$整除的三次四重数有泛平凡的${\rm CH}_0$群.

英文摘要:

We study the existence of a Chow-theoretic decomposition of the diagonal of a smooth cubic hypersurface, or equivalently, the universal triviality of its ${\rm CH}_0$-group. We prove that for odd dimensional cubic hypersurfaces or for cubic fourfolds, this is equivalent to the existence of a cohomological decomposition of the diagonal, and we translate geometrically this last condition. For cubic threefolds $X$, this turns out to be equivalent to the algebraicity of the minimal class $θ^4/4!$ of the intermediate Jacobian $J(X)$. In dimension $4$, we show that a special cubic fourfold with discriminant not divisible by $4$ has universally trivial ${\rm CH}_0$ group.

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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