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

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Let GG be the reductive group in the local Shimura-variety setting, let mumu be the relevant dominant cocharacter, and let b∈B(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 lab∈X∙(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

(Vμ∣G^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.

References

Primary source

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

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