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arXiv 2212.12971math.AG
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周期指数问题与Hodge理论

The period-index problem and Hodge theory

Aise Johan de Jong, Alexander Perry

摘要:

在2次Lefschetz标准猜想的条件下,证明了光滑射影簇上的Brauer类的指数在光滑族中均匀地整除其周期的一个固定幂.在另一个方向,我们重新解释更经典的条款霍奇基斯最近的工作,使霍奇理论的下界的指数布劳尔类。我们还证明了我们的结果在任意代数闭基领域的版本,并作为一个应用构造定性新的反例的整体泰特猜想。

英文摘要:

Conditional on the Lefschetz standard conjecture in degree 2, we prove that the index of a Brauer class on a smooth projective variety divides a fixed power of its period, uniformly in smooth families. In the other direction, we reinterpret in more classical terms recent work of Hotchkiss which gives Hodge-theoretic lower bounds on the index of Brauer classes. We also prove versions of our results over arbitrary algebraically closed base fields, and as an application construct qualitatively new counterexamples to the integral Tate conjecture.

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