For non-principal χ mod prime p, the max over θ of |sum_{αp < n ≤ βp} χ(n) e(nθ)| satisfies √p log log p ≪ max ≪ √p log p.
Improved lower bound for the Mahler measure of the Fekete polynomials
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Large values of shifted mixed character sums
For non-principal χ mod prime p, the max over θ of |sum_{αp < n ≤ βp} χ(n) e(nθ)| satisfies √p log log p ≪ max ≪ √p log p.