Finkelberg–Mirković conjecture for Iwahori-constructible perverse sheaves

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Let Gatur\boldsymbol{G}^ atur be a complex connected reductive group Langlands-dual to G\boldsymbol{G}, let β\beta be a field of coefficients, and let Gr=G\natur(C((z)))/G\natur(C[[z]])\mathrm{Gr}=\boldsymbol{G}^\natur(\mathbb{C}((z)))/\boldsymbol{G}^\natur(\mathbb{C}[[z]]) be its affine Grassmannian. Write Perv(Iw)(Gr,β)\mathsf{Perv}_{(\mathrm{Iw})}(\mathrm{Gr},\beta) for the category of Iwahori-constructible perverse sheaves, Rep∅(G)\mathsf{Rep}_\varnothing(G) for the relevant representation category, ICλ\mathcal{IC}_\lambda for the simple perverse sheaf attached to the Iwahori orbit indexed by λ\lambda, and For⁡GG˙\operatorname{For}^{\dot G}_G for Frobenius pullback. Finkelberg–Mirković conjecture. There exists an equivalence of highest-weight categories

Q:Perv(Iw)(Gr,β)→∼Rep∅(G)Q: \mathsf{Perv}_{(\mathrm{Iw})}(\mathrm{Gr},\beta) \xrightarrow{\sim} \mathsf{Rep}_\varnothing(G)

such that Q(ICλ)≅L(wλ∙0)Q(\mathcal{IC}_\lambda)\cong\mathsf{L}(w_\lambda\bullet0) for every λ∈X\lambda\in\mathbf{X}, and such that, for every F∈Perv(Iw)(Gr,β)\mathcal{F}\in\mathsf{Perv}_{(\mathrm{Iw})}(\mathrm{Gr},\beta) and G∈Pervsph(Gr,β)\mathcal{G}\in\mathsf{Perv}_{\mathrm{sph}}(\mathrm{Gr},\beta), there is a bifunctorial isomorphism

Q(F⋆G)≅Q(F)⊗For⁡GG˙(S(G)).Q(\mathcal{F}\star\mathcal{G})\cong Q(\mathcal{F})\otimes\operatorname{For}^{\dot G}_G(\mathcal{S}(\mathcal{G})).

This conjecture relates the Iwahori-constructible geometric Satake category to representations in the principal block and remains open at the moment.

References

Primary source

Pramod N. Achar and Simon Riche, “Reductive groups, the loop Grassmannian, and the Springer resolution”, arXiv:1602.04412 (2018).

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