Conjecture on perfectoidness of Shimura varieties at infinite pp-level

Let (G,μ)(G,\mu) be a Shimura datum, and fix a level KpG(A,p)K^p\subset G(\mathbb{A}^{\infty,p}) away from pp. The inverse limit over compact open subgroups KpG(Qp)K_p\subset G(\mathbb{Q}_p) is

limKpShKpKp(G,μ).\varprojlim_{K_p}\operatorname{Sh}_{K_pK^p}(G,\mu).

Global perfectoidness conjecture. This inverse limit is representable by a perfectoid space. Perfectoidness at infinite pp-level is a central representability question for Shimura varieties beyond the cases covered by the established theory; the supplied status is unknown.

Sources & referencesView supporting material

Primary source

Mohammad Hadi Hedayatzadeh and Ali Partofard, “Embeddings of Certain Exceptional Shimura Varieties into Siegel Modular Varieties”, arXiv:2506.21217 (2026).

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