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A Pólya–Vinogradov inequality for short character sums

Part of: Exponential sums and character sums

Published online by Cambridge University Press:  02 December 2020

Matteo Bordignon
Matteo Bordignon*
Affiliation:
School of Science, University of New South Wales Canberra, Canberra, Australia
*
e-mail:[email protected]
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Abstract

In this paper, we obtain a variation of the Pólya–Vinogradov inequality with the sum restricted to a certain height. Assume $\chi $ to be a primitive character modulo q, $ \epsilon>0$ and $N\le q^{1-\gamma }$ , with $0\le \gamma \le 1/3$ . We prove that

$$ \begin{align*} |\sum_{n=1}^N \chi(n) |\le c (\tfrac{1}{3} -\gamma+\epsilon )\sqrt{q}\log q \end{align*} $$
with $c=2/\pi ^2$ if $\chi $ is even and $c=1/\pi $ if $\chi $ is odd. The result is based on the work of Hildebrand and Kerr.

Keywords

Character sumsPólya-Vinogradov inequality

MSC classification

Primary: 11L05: Gauss and Kloosterman sums; generalizations
Secondary: 11L40: Estimates on character sums
Type
Article
Information
Canadian Mathematical Bulletin , Volume 64 , Issue 4 , December 2021 , pp. 906 - 910
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Copyright
© Canadian Mathematical Society 2020

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References

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