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Fourier-Jacobi models of Deligne-Lusztig characters and depth zero local descent for unitary groups

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arxiv 2208.02308 v2 pith:CFKAZPY6 submitted 2022-08-03 math.RT math.NT

classification math.RTmath.NT
keywords groupsunitarycharactersdeducedeligne-lusztigdepthdescentexplicit
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abstract

In this paper, we deduce explicit multiplicity formulas of the Fourier-Jacobi model for Deligne-Lusztig characters of finite symplectic groups, unitary groups, and general linear groups. We then apply these results to deduce the explicit depth zero local descent (\`a la Soudry and Tanay) for $p$-adic unitary groups. The result is a concrete example in the context of non-tempered Gan-Gross-Prasad program.

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