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arXiv 1508.00512math.NT
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关于迹函数的短和

On short sums of trace functions

É. Fouvry, E. Kowalski, Ph. Michel, C S. Raju, J. Rivat, K. Soundararajan

摘要:

我们考虑了循环群中区间上的振荡函数的和,循环群的大小接近于群的大小的平方根。首先,我们证明了非平凡的估计区间长度略大于这个平方根(桥接“Polyá-Vinogradov差距”在某种意义上)有界函数有界傅里叶变换。然后,我们证明了在离散傅里叶变换下,在略低于平方根界的范围内非平凡估计的存在性是稳定的,并且我们给出了与有限域上的迹函数相关的应用。

英文摘要:

We consider sums of oscillating functions on intervals in cyclic groups of size close to the square root of the size of the group. We first prove non-trivial estimates for intervals of length slightly larger than this square root (bridging the "Polyá-Vinogradov gap" in some sense) for bounded functions with bounded Fourier transforms. We then prove that the existence of non-trivial estimates for ranges slightly below the square-root bound is stable under the discrete Fourier transform, and we give applications related to trace functions over finite fields.

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