Rachel Ollivier (UBC)

Eisenstein cohomology and the special values of automorphic L-functions.

Abstract: Given a p-adic reductive group G and its (pro-p) Iwahori-Hecke algebra H, we are interested in the link between the category of smooth representations of G and the category of H-modules. When the field of coefficients has characteristic zero this link is well understood by work of Bernstein and Borel. In characteristic p things are still poorly understood. In this case the role of the Iwahori-Hecke algebra H is played by a derived version of this algebra. In particular, by work of Peter Schneider, the module category over this derived Hecke algebra is equivalent to the derived category of smooth representations of G. Unlike in the case of H, we know little about the structure of this derived Hecke algebra. In this talk I will report on joint work with Peter Schneider where we take the first steps in this direction by studying the cohomology of the derived Hecke algebra.