Finkelberg–Mirković conjecture for Iwahori-constructible perverse sheaves

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 ForGG˙\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(wλ0)Q(\mathcal{IC}_\lambda)\cong\mathsf{L}(w_\lambda\bullet0) for every λX\lambda\in\mathbf{X}, and such that, for every FPerv(Iw)(Gr,β)\mathcal{F}\in\mathsf{Perv}_{(\mathrm{Iw})}(\mathrm{Gr},\beta) and GPervsph(Gr,β)\mathcal{G}\in\mathsf{Perv}_{\mathrm{sph}}(\mathrm{Gr},\beta), there is a bifunctorial isomorphism

Q(FG)Q(F)ForGG˙(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.

Sources & referencesView supporting material

Primary source

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

Progress summary

Never refreshed

Nothing recorded yet. Refresh searches the literature and the public web for attempts on this problem, and writes the first summary here.

Solutions 0

No solutions have been posted yet.