Coassembly and the $K$-theory of finite groups

Abstract

We study the $K$-theory and Swan theory of the group ring $R[G]$, when $G$ is a finite group and $R$ is any ring or ring spectrum. In this setting, the well-known assembly map for $K(R[G])$ has a companion called the coassembly map. We prove that their composite is the equivariant norm of $K(R)$. This gives a splitting of both assembly and coassembly after $K(n)$-localization, a new map between Whitehead torsion and Tate cohomology, and a partial computation of $K$-theory of representations in the category of spectra.

Accepted version. 44 pages

References in corpus (1)

• On the Farrell-Jones Conjecture for higher algebraic K-theory

Cited by in corpus (3)

• Periodic points and topological restriction homology
• Coassembly is a homotopy limit map
• $K$-theoretic torsion and the zeta function