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arXiv 2209.02170math.NT
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数域与函数域中野生 Kloosterman 和的大小

The size of wild Kloosterman sums in number fields and function fields

Will Sawin

AI总结:

本文研究一般p-adic环及等特征局部环上的p-adic超Kloosterman和,利用稳定相位估计给出其大小的本质精确上下界,推广了已知结果并应用于函数域数论。

摘要:

我们研究一般 p-adic 环乃至等特征局部环上的 p-adic 超 Kloosterman 和,它是 Kloosterman 和的一种带参数 k 的推广,当 k=2 时恢复经典 Kloosterman 和。当 k 不被 p 整除时,这些和可由一个简单的稳定相位估计求值,从而给出其大小的本质上精确的界。当 k 被 p 整除时,我们给出一个更复杂的稳定相位估计来求值它们。这同时给出一个上界和一个下界,表明该上界本质上是精确的。这推广了 Cochrane、Liu 和 Zhen 先前在 $\mathbb Z_p$ 情形下已知的界。等特征情形下的下界对函数域数论有两个应用,表明某些短区间和与 Dirichlet L-函数的某些矩并不像人们可能希望的那样具有平方根相消。

英文摘要:

We study p-adic hyper-Kloosterman sums, a generalization of the Kloosterman sum with a parameter k that recovers the classical Kloosterman sum when k=2, over general p-adic rings and even equal characteristic local rings. These can be evaluated by a simple stationary phase estimate when k is not divisible by p, giving an essentially sharp bound for their size. We give a more complicated stationary phase estimate to evaluate them in the case when k is divisible by p. This gives both an upper bound and a lower bound showing the upper bound is essentially sharp. This generalizes previously known bounds of Cochrane, Liu, and Zhen in the case of $\mathbb Z_p$. The lower bounds in the equal characteristic case have two applications to function field number theory, showing that certain short interval sums and certain moments of Dirichlet L-functions do not, as one might hope, admit square-root cancellation.

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