Conjectural Iwahori-equivariant orthosymplectic Satake equivalence

Let V0V_0 and V1V_1 be respectively orthogonal and symplectic vector spaces, let \Ffl1\Ffl_1 be the variety of complete self-orthogonal flags in V1V_1, and let \Ffl0\Ffl_0 be a chosen connected component of the variety of complete self-orthogonal flags in V0V_0. Define the shifted dg-scheme with trivial differential

\onH\osp:=(V0V1)[1]×\Ffl0×\Ffl1.\on{H}_\osp:=(V_0\otimes V_1)[1]\times\Ffl_0\times\Ffl_1.

For AV0V1Hom(V0,V1)A\in V_0\otimes V_1\cong\operatorname{Hom}(V_0,V_1), write AtHom(V1,V0)A^t\in\operatorname{Hom}(V_1,V_0) for its adjoint, and write Fi=(Fi(1)Fi(2)Fi(dimVi)=Vi)F_i=(F_i^{(1)}\subset F_i^{(2)}\subset\cdots\subset F_i^{(\dim V_i)}=V_i) for a flag. The orthosymplectic Steinberg scheme is

\onSt\osp={(A,F0,F1)\onH\ospAtA(F0(r))F0(r) and AAt(F1(r))F1(r), r}.\on{St}_\osp=\{(A,F_0,F_1)\in\on{H}_\osp\mid A^tA(F^{(r)}_0)\subseteq F^{(r)}_0\ \text{and}\ AA^t(F^{(r)}_1)\subseteq F^{(r)}_1,\ \forall r\}.

Let \bIN1\SO(N1,\bO)\bI_{N-1}\subset\SO(N-1,\bO) and \bIN\SO(N,\bO)\bI_N\subset\SO(N,\bO) be Iwahori subgroups, let \Fl\SON:=\SO(N,\bF)/\bIN\Fl_{\SO_N}:=\SO(N,\bF)/\bI_N, and let D\bIN1b(\Fl\SON)D^b_{\bI_{N-1}}(\Fl_{\SO_N}) be the bounded \bIN1\bI_{N-1}-equivariant constructible derived category. The conjectural Iwahori-equivariant orthosymplectic Satake equivalence. There exists an equivalence of triangulated categories

D\SO(V0)×\Sp(V1)Coh(\onSt\osp)D\bIN1b(\Fl\SON).D^{\SO(V_0)\times\Sp(V_1)} \operatorname{Coh}(\on{St}_\osp)\cong D^b_{\bI_{N-1}}(\Fl_{\SO_N}).

This proposes an Iwahori-equivariant enhancement of the orthosymplectic Satake correspondence, relating coherent sheaves on the orthosymplectic Steinberg scheme to constructible sheaves on an affine flag variety. The source provides no resolution status for this equivalence.

Sources & referencesView supporting material

Primary source

Alexander Braverman, Michael Finkelberg and Roman Travkin, “Orthosymplectic Satake equivalence”, arXiv:1912.01930 (2022).

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.