Chen–Zhu's conjecture on irreducible components of affine Deligne–Lusztig varieties

Let GG be the reductive group in the local Shimura-variety setting, let mumu be the relevant dominant cocharacter, and let bB(G)b\in B(G) be a σ\sigma-conjugacy class. Write Xμ(b)X_\mu(b) for the corresponding affine Deligne–Lusztig variety, Jb(F)J_b(F) for the group acting on it, and let labX(T^)σla_b\in\mathbb{X}^\bullet(\hat T)_\sigma be the element attached to bb, described as the best integral approximation to the Newton point nubnu_b. Chen–Zhu's conjecture. The Jb(F)J_b(F)-orbits of the set of irreducible components of Xμ(b)X_\mu(b) canonically give a basis of

(VμG^σ)(λb).(V_\mu|_{\hat G^\sigma})(\lambda_b).

This conjecture predicts a representation-theoretic description of the irreducible components of affine Deligne–Lusztig varieties and extends the finite Deligne–Lusztig setting. The source gives no resolution.

Sources & referencesView supporting material

Primary source

Liang Xiao and Xinwen Zhu, “Cycles on Shimura varieties via geometric Satake”, arXiv:1707.05700 (2017).

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