Équirépartition de sommes exponentielles (travaux de Katz)

Many exponential sums over finite fields, including Gauss sums and Kloosterman sums, arise as the Fourier transform with respect to a character of the trace function of an \(\ell\)-adic sheaf on a commutative algebraic group. We study the equidistribution of these sums when the sheaf is fixed but th...

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Published in:arXiv.org 2019-11
Main Author: Fresán, Javier
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Fields (mathematics)
Fourier transforms
Group theory
Sums
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description Many exponential sums over finite fields, including Gauss sums and Kloosterman sums, arise as the Fourier transform with respect to a character of the trace function of an \(\ell\)-adic sheaf on a commutative algebraic group. We study the equidistribution of these sums when the sheaf is fixed but the character varies over larger and larger extensions of the finite field. For the additive group, monodromy governs equidistribution by a theorem of Deligne. A few years ago, Katz solved the multiplicative variant of the question in a work where Tannakian ideas play an essential role.
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subjects Fields (mathematics)
Fourier transforms
Group theory
Sums
title Équirépartition de sommes exponentielles (travaux de Katz)
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