# A derived Hecke algebra in the context of the mod $p$ Langlands program

 Workshop on Motives, Galois Representations and Cohomology Around the Langlands Program Topic: A derived Hecke algebra in the context of the mod $p$ Langlands program Speaker: Rachel Ollivier Affiliation: University of British Columbia Date: Wednesday, November 8 Time/Room: 2:30pm - 3:30pm/S-101 Video Link: https://video.ias.edu/MotivesGaloisRepsandCohomology/2017/1108-RachelOllivier

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 pro-p Iwahori-Hecke algebra H is played by a differential graded Hecke algebra. In particular, by work of Peter Schneider, the module category over the d.g. 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 d.g. 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 d.g. Hecke algebra.