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Arithmetic Fourier transforms over finite fields: generic vanishing, convolution, and equidistribution

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arxiv 2109.11961 v6 pith:JEKNSRSC submitted 2021-09-24 math.NT math.AG

classification math.NTmath.AG
keywords fouriertransformsarithmeticconvolutionequidistributionfunctionsgeneralgeneric
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We study the arithmetic Fourier transforms of trace functions on general connected commutative algebraic groups. To do so, we first prove a generic vanishing theorem for twists of perverse sheaves by characters, and using this tool, we construct a tannakian category with convolution as tensor operation. Using Deligne's Riemann Hypothesis, we show how this leads to a general equidistribution theorem for the discrete Fourier transforms of trace functions of perverse sheaves, generalizing the work of Katz in the case of the multiplicative group. We then give some concrete examples of applications of these results and raise a number of questions.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Wasserstein metrics and quantitative equidistribution of exponential sums over finite fields

    math.NT 2025-05 accept novelty 8.0 of 10

    Explicit Wasserstein-distance rates are proved for equidistribution of ultra-short exponential sums and of Deligne-Katz trace-function families over finite fields.

  2. On a Conjecture of Erd\H{o}s over Function Fields

    math.NT 2025-10 reject novelty 4.0 of 10

    For large enough finite fields, every residue class modulo a squarefree degree-n polynomial is claimed to be a product of two monic irreducible polynomials of degree at most n, via a one-dimensional Katz equidistribut...

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