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Bounds on bilinear forms with Kloosterman sums

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arxiv 2204.05038 v5 pith:U6IDCZSA submitted 2022-04-11 math.NT

classification math.NT
keywords bilinearformskloostermansumsboundskowalskimichelestimates
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abstract

We prove new bounds on bilinear forms with Kloosterman sums, complementing and improving a series of results by \'E. Fouvry, E. Kowalski and Ph. Michel (2014), V. Blomer, \'E. Fouvry, E. Kowalski, Ph. Michel and D. Mili\'cevi\'c (2017), E. Kowalski, Ph. Michel and W. Sawin (2019, 2020) and I. E. Shparlinski (2019). These improvements rely on new estimates for Type II bilinear forms with incomplete Kloosterman sums. We also establish new estimates for bilinear forms with one variable from an arbitrary set by introducing techniques from additive combinatorics over prime fields. Some of these bounds have found a crucial application in the recent work of Wu (2020) on asymptotic formulas for the fourth moments of Dirichlet $L$-functions. As new applications, an estimate for higher moments of averages of Kloosterman sums and the distribution of divisor function in a family of arithmetic progressions are also given.

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Cited by 2 Pith papers

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  1. First moments of ${\rm{GL}} (3) \times {\rm{GL}} (2)$ and ${\rm{GL}} (2)$ $L$-functions and their applications

    math.NT 2025-01 conditional novelty 7.0 of 10

    The paper establishes a new simultaneous level-aspect subconvexity range for self-dual GL(3)xGL(2) L-functions and a Lindelof average bound in the weight aspect.

  2. Hybrid bounds for ${\rm{GL}}(4)\times {\rm{GL}}(1)$ twisted $L$-functions

    math.NT 2025-01 reject novelty 6.0 of 10

    A hybrid subconvex bound for L(1/2, Pi tensor chi) is claimed for prime level P and conductor M with M^{1/5} < P < M^{2/5}, but the final exponent passage in the proof is not justified.

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