The regular Kim–Yu type realization conjecture

Assume that p2p\neq 2 is not bad for G\mathbf{G}, and let (T,θ)(\mathbf{T},\theta) be an unramified Howe-factorizable pair. Let ϕ=(ϕ1,,ϕd)\vec\phi=(\phi_{-1},\ldots,\phi_d) be a Howe factorization for θ\theta, and let rTrGr(θ)r_{\mathbb{T}_r}^{\mathbb{G}_r}(\theta) denote the modified positive-depth Deligne–Lusztig representation defined from this factorization. Let Gx,0G_{\mathbf{x},0} be the associated parahoric quotient and K0K_0 the subgroup carrying the associated Kim–Yu type. Regular Kim–Yu type realization conjecture. The representation rTrGr(θ)r_{\mathbb{T}_r}^{\mathbb{G}_r}(\theta) of Gx,0G_{\mathbf{x},0} is a linear combination of Bushnell–Kutzko types, and its restriction to K0K_0 contains the AFMO-twisted Kim–Yu type associated to (T,θ)(\mathbf{T},\theta). This would provide a general realization of regular Kim–Yu types through modified positive-depth Deligne–Lusztig induction; the statement is presented as a conjecture, with no resolution given here.

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Primary source

Charlotte Chan and Masao Oi, “Green functions for positive-depth Deligne–Lusztig induction”, arXiv:2506.04449 (2025).

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