The COP-Farrell-Jones conjecture for Hecke algebras

Let GG be a td-group, meaning a locally compact, second countable, totally disconnected Hausdorff group. Let RR be a uniformly regular ring with QR\mathbb{Q} \subseteq R, where uniformly regular means Noetherian and such that some uniform finite bound exists on the lengths of projective resolutions of finitely generated projective RR-modules. Let H(G;R)\mathcal{H}(G;R) be the Hecke algebra, let HnG(;KR)H_n^G(-;\mathbf{K}_R) be a smooth GG-homology theory with HnG(G/U;KR)Kn(H(U;R))H_n^G(G/U;\mathbf{K}_R) \cong K_n(\mathcal{H}(U;R)) for every open subgroup UU, and let ECop(G)E_{{\mathcal{C}\hspace{-1pt}\mathrm{op}}}(G) be the classifying space for proper smooth GG-actions.

COP-Farrell-Jones conjecture for Hecke algebras. For every uniformly regular ring RR with QR\mathbb{Q} \subseteq R, the projection

ECop(G)G/GE_{{\mathcal{C}\hspace{-1pt}\mathrm{op}}}(G) \to G/G

induces, for every nZn \in \mathbb{Z}, an isomorphism

HnG(ECop(G);KR)HnG(G/G;KR)=Kn(H(G;R)).H^G_n(E_{{\mathcal{C}\hspace{-1pt}\mathrm{op}}}(G);\mathbf{K}_R) \xrightarrow{\cong} H^G_n(G/G;\mathbf{K}_R) = K_n(\mathcal{H}(G;R)).

This conjecture is stated in the source as a formulation of the KK-theoretic Farrell-Jones conjecture for Hecke algebras of totally disconnected groups. It is known for reductive pp-adic groups in the cited forthcoming work, while the general case remains open.

Sources & referencesView supporting material

Primary source

Arthur Bartels and Wolfgang Lueck, “Inheritance properties of the Farrell-Jones Conjecture for totally disconnected groups”, arXiv:2306.01518 (2023).

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