Non-vanishing mod $p$ of derived Hecke algebras of multiplicative groups over number fields, II

Abstract

We investigate the derived Hecke action on the cohomology of an arithmetic manifold associated to the multiplicative group over a number field. Under mild assumptions, we prove that the derived Hecke action is non-vanishing modulo $p$ in every degree. Moreover, the total cohomology ring with ${\mathbb{F}}_p$-coefficients is a free graded module of rank one over the derived Hecke algebra, generated in degree zero.