Abstract:
We obtain a new bound on certain double sums of multiplicative characters which improves several previous results. This improvement comes from new bounds on the number of collinear triples in finite fields, which is a classical object of study in additive combinatorics.
Keywords:
finite field, character sums, collinear triples, multiplicative energy.
The work of the first author (Section 2) is supported by the Russian Science Foundation under grant 14-11-00433. The work of the second author is supported by the Australian Research Council, grant nos. DP170100786 and DP180100201.
Citation:
I. D. Shkredov, I. E. Shparlinski, “Double character sums with intervals and arbitrary sets”, Harmonic analysis, approximation theory, and number theory, Collected papers. Dedicated to Academician Sergei Vladimirovich Konyagin on the occasion of his 60th birthday, Trudy Mat. Inst. Steklova, 303, MAIK Nauka/Interperiodica, Moscow, 2018, 258–278; Proc. Steklov Inst. Math., 303 (2018), 239–258