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Preprint Number 202

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202. Ehud Hrushovski, David Kazhdan
Motivic Poisson Summation
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Submission date: 21 September 2009.

Abstract:

We develop a "motivic integration" version of the Poisson summation formula for function fields, with values in the Grothendieck ring of definable exponential sums. We also study division algebras over the function field, and obtain relations among the motivic Fourier transforms of a test function at different completions. We use these to prove, in a special case, a motivic version of a theorem of Deligne-Kazhdan-Vigneras.

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