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On the Supersingular Locus of the $\mathrm{GU}(2,n-2)$ Shimura Variety

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arxiv 2410.05110 v2 pith:MWFRLYVS submitted 2024-10-07 math.AG math.NT

classification math.AGmath.NT
keywords locussupersingularmathrmshimuravarietyattachedclassicalconcretely
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abstract

We study the supersingular locus of a reduction at an inert prime of the Shimura variety attached to $\mathrm{GU}(2,n-2)$. More concretely, we decompose the supersingular locus into a disjoint union of iterated fibrations over (classical) Deligne-Lusztig varieties after taking perfection.

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Cited by 2 Pith papers

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

  1. On the classification of indecomposable Ekedahl-Oort strata in unitary Shimura varieties, and related Newton polygons

    math.NT 2026-06 conditional novelty 7.0 of 10

    Unitary BT1 modules for GU(a,b) with p inert decompose uniquely into unitary/Serre unicycles and bicycles, and the associated Ekedahl-Oort strata intersect explicitly computed Newton strata, including the supersingula...

  2. The Bruhat-Tits stratification for basic unramified $GU(1,n-1)$ Rapoport-Zink spaces at arbitrary parahoric level

    math.NT 2025-10 conditional novelty 6.0 of 10

    At arbitrary parahoric level, the reduced special fiber of the GU(1,n−1) Rapoport-Zink space is stratified by closures of fine Deligne-Lusztig varieties, with incidence controlled by Bruhat-Tits indices and n−m+1 J(E)...

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