Chinello–Dat conjecture on endo-parameter blocks for inner forms

Let (G,h)({\rm G},h) be an inner form of a general linear group or of a classical group with peq2p eq 2, and let t\frak{t} be an endo-parameter for G{\rm G}. Let R{\rm R} be an integral domain and a \bbZ[1/p,bcpinfty]\bbZ[1/p,bc_{p^infty}]-algebra. ChinelloDat conjecture. There is an equivalence of categories

RepR(t)RepR(0Gβ).\operatorname{Rep}_{{\rm R}}(\mathfrak{t})\simeq \operatorname{Rep}_{{\rm R}}(\mathbf{0}_{{\rm G}_{\beta}}).

This conjecture generalizes a result of Chinello and is related to predictions of Dat; it proposes that the category attached to an endo-parameter is equivalent to the category associated with the zero endo-parameter for the corresponding group.

Sources & referencesView supporting material

Primary source

David Helm, Robert Kurinczuk, Daniel Skodlerack and Shaun Stevens, “Block decompositions for p-adic classical groups and their inner forms”, arXiv:2405.13713 (2026).

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