Geometric local theta correspondence for dual reductive pairs of type II at the Iwahori level

Abstract

In this paper we are interested in the geometric local theta correspondence at the Iwahori level for dual reductive pairs ( G , H ) (G,H) of type II over a non-Archimedean field of characteristic p ≠ 2 p\neq 2 in the framework of the geometric Langlands program. We consider the geometric version of the I H × I G I_{H}\times I_{G} -invariants of the Weil representation S I H × I G \mathcal {S}^{I_{H}\times I_{G}} as a bimodule under the action of Iwahori-Hecke algebras H I G \mathcal {H}_{I_{G}} and H I H \mathcal {H}_{I_{H}} and we give some partial geometric description of the corresponding category under the action of Hecke functors. We also define geometric Jacquet functors for any connected reductive group G G at the Iwahori level and we show that they commute with the Hecke action of the H I L \mathcal {H}_{I_{L}} -subelgebra of H I G \mathcal {H}_{I_{G}} for a Levi subgroup L L .