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arXiv 1602.06607math.AGmath.ATmath.CV
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为什么要计算代数圈的周期?

Why should one compute periods of algebraic cycles?

Hossein Movasati

摘要:

在这篇文章中,我们展示了如何在代数周期的代数微分形式的积分的数据可以用来证明,代数和霍奇周期变形的一个给定的代数周期是等价的。作为一个例子,我们证明了费马六次四重体的大多数霍奇圈和代数圈不能在底层参数空间中变形。然后,我们在费马簇内取两个线性循环的差,并收集证据表明,与此对应的霍奇轨迹是光滑和简化的。这意味着在费马簇中存在新的代数圈,其存在是由霍奇猜想对所有超曲面预测的,但不是费马簇本身。

英文摘要:

In this article we show how the data of integrals of algebraic differential forms over algebraic cycles can be used in order to prove that algebraic and Hodge cycle deformations of a given algebraic cycle are equivalent. As an example, we prove that most of the Hodge and algebraic cycles of the Fermat sextic fourfold cannot be deformed in the underlying parameter space. We then take a difference of two linear cycles inside the Fermat variety, and gather evidences that the Hodge locus corresponding to this is smooth and reduced. This implies the existence of new algebraic cycles in the Fermat variety whose existence is predicted by the Hodge conjecture for all hypersurfaces, but not the Fermat variety itself.

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