A twisted version of geometric Satake theory
The geometric Satake theory gives the following equivalence of tensor categories
RepG≅→PervˆG(k[[t]])(\GrˆG)
between the category of algebraic representations of a reductive group G and certain category of equivariant perverse sheaves on the affine Grassmannian of the dual group of G (defined over an algebraically closed field k). We consider the case when k has characteristic p>0, and extend this equivalence to a natural morphism
Cohfr([G/Ad(G)])→Perv(ShtˆG)
from the category of locally free coherent sheaves on the stack [G/Ad(G)], to the category of perverse sheaves on the moduli of local shtukas for the dual group ˆG. If time permits, I will discuss the motivation of such a construction coming from the geometry of Shimura varieties. This is a joint work with Xinwen Zhu.