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Parametrization of supercuspidal representations of depth zero for some simple adjoint groups

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arxiv 2504.17225 v1 pith:L2SVQWXG submitted 2025-04-24 math.RT math.NT

classification math.RTmath.NT
keywords representationsadjointclassesdepth-zerogroupsparametrizationsimplesupercuspidal
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We construct a surjective map from the set of conjugacy classes of depth-zero cuspidal enhanced L-parameters to that of isomorphism classes of depth-zero supercuspidal representations for simple adjoint groups, and check the bijectivity in various cases. We also prove that the Hiraga--Ichino--Ikeda conjecture on the formal degree of essentially square-integrable irreducible representations holds for this parametrization if it is bijective.

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  1. Endoscopy for representations of disconnected reductive groups over finite fields

    math.RT 2025-07 accept novelty 6.0 of 10

    Finite-field reductive group representation series with fixed semisimple parameter are canonically equivalent to unipotent representations of endoscopic groups with equivariant structure, including for disconnected groups.

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