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\'Etale metaplectic covers of reductive group schemes

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arxiv 2204.00610 v2 pith:5QMMIIXE submitted 2022-04-01 math.AG

classification math.AG
keywords metaplecticalgebraiccocyclescoversdescriptionetalegrouplinear
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abstract

Given a reductive group scheme $G$, we give a linear algebraic description of reduced \'etale $4$-cocycles on its classifying stack $\mathrm B(G)$. These cocycles form a $2$-groupoid, which we interpret as parameters of metaplectic covers of $G$. We use our linear algebraic description to define the Langlands dual of a metaplectic cover.

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  1. What are the extended pure inner forms of a cover?

    math.RT 2025-06 conditional novelty 7.0 of 10

    For any étale metaplectic cover of a reductive p-adic group, a cover of each extended pure inner form is constructed, and the paper shows the set of forms whose Weissman obstruction vanishes is a torsor under a Galois...

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