Relative assembly maps and the K-theory of Hecke algebras in prime characteristic

Abstract We investigate the relative assembly map from the family of finite subgroups to the family of virtually cyclic subgroups for the algebraic K -theory of twisted group rings of a group G with coefficients in a regular ring R or, more generally, with coefficients in a regular additive category. They are known to be isomorphisms rationally. We show that it suffices to invert only those primes p for which G contains a non-trivial finite p -group and p is not invertible in R . The key ingredient is the detection of Nil-terms of a twisted group ring of a finite group F after localizing at p in terms of the p -subgroups of F using Verschiebungs and Frobenius operators. We construct and exploit the structure of a module over the ring of big Witt vectors on the Nil-terms. We analyze the algebraic K -theory of the Hecke algebras of subgroups of reductive p -adic groups in prime characteristic.