Abstract
Let F q be the finite field consisting of q = p r elements and yy an additive character of the field F q . Take an arbitrary multiplicative subgroup H of size |H| > q C/(log log q) for some constant C > 0 not largely contained in any multiplicative shift of a subfield. We show that |Σ h∈H yy(h)| = o(|H|). This means that H is equidistributed in F q .
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Bourgain, J., Glibichuk, A. Exponential sum estimates over a subgroup in an arbitrary finite field. JAMA 115, 51–70 (2011). https://doi.org/10.1007/s11854-011-0023-x
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DOI: https://doi.org/10.1007/s11854-011-0023-x