Conjecture on derived ordinary parts of a Bruhat-cell compact induction

Let WW be the Weyl group of (G,S)(\mathbf{G},\mathbf{S}), let I,JΔI,J\subseteq\Delta, let σ\sigma be a locally admissible smooth representation of LIL_I over AA, let IwJIWJ{}^Iw^J\in{}^IW^J be a minimal double-coset representative, and let nNn\in\mathbb{N}. Let dIwJd_{{}^Iw^J} be the associated integer and δIwJ\delta_{{}^Iw^J} the associated algebraic character of LJIwJ1(I)\mathbf{L}_{J\cap{}^Iw^J{}^{-1}(I)}. Derived ordinary-parts conjecture. There is a natural A[LJ]A[L_J]-linear isomorphism

HnOrdPJ(c-indPIPIIwJPJσ)IndLJPJIwJ1(I)LJ((Hn[F:Qp]dIwJOrdLIPIIwJ(J)σ)IwJ(ω1δIwJ)).\mathrm{H}^{n}\operatorname{Ord}_{P_J}\left(\operatorname{c-ind}_{P_I^-}^{P_I^-{}^Iw^JP_J}\sigma\right)\cong\operatorname{Ind}_{L_J\cap P_{J\cap{}^Iw^J{}^{-1}(I)}^-}^{L_J}\left(\left(\mathrm{H}^{n-[F:\mathbb{Q}_p]d_{{}^Iw^J}}\operatorname{Ord}_{L_I\cap P_{I\cap{}^Iw^J(J)}}\sigma\right)^{{}^Iw^J}\otimes\left(\omega^{-1}\circ\delta_{{}^Iw^J}\right)\right).

This would compute derived ordinary parts cell by cell in the Bruhat filtration of parabolic induction, a key step toward understanding derived ordinary parts of induced representations. The statement is presented as a conjecture, and no resolution status is supplied in the source.

Sources & referencesView supporting material

Primary source

Julien Hauseux, “Parabolic induction and extensions”, arXiv:1607.02031 (2017).

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