Timo Siebenand

activity

20192026

C^{*}

-algebras of simple Lie groups with real rank one

8 citations · 11 across the 5 of their papers we have counts for

collaborators

6 papers

math.OA2026

Crossed product functors associated to $ℓ^{p}$ -pseudofunctions

Jacek Krajczok, Ebrahim Samei, Timo Siebenand +1

We show that the $ℓ^{p}$ -pseudofunctions, which were recently shown to lead to exotic completions of group $C^{*}$ -algebras by Wiersma and the second named author, can be used to co…

math.OA2021

Partial tensor-product functors and crossed-product functors

Julian Kranz, Timo Siebenand

For a given discrete group $G$ , we apply results of Kirchberg on exact and injective tensor products of $C^{*}$ -algebras to give an explicit description of the minimal exact correspo…

math.OA2020★ 1 cited

Group $C^{*}$ -algebras of locally compact groups acting on trees

Dennis Heinig, Tim de Laat, Timo Siebenand

We study the group $C^{*}$ -algebras $C_{L^{p +}}^{*} (G)$ - constructed from $L^{p}$ -integrability properties of matrix coefficients of unitary representations - of locally compact groups…

math.OA2020★ 2 cited

On the ideal structure of the Fourier-Stieltjes algebra of certain groups

Timo Siebenand

We determine the structure of the weak*-closed $G$ -invariant ideals in the Fourier-Stieltjes algebra $B (G)$ of certain groups $G$ by means of a $K$ -theoretical obstruction. The gro…

math.OA2019★ 8 cited

Exotic group $C^{*}$ -algebras of simple Lie groups with real rank one

Tim de Laat, Timo Siebenand

Exotic group $C^{*}$ -algebras are $C^{*}$ -algebras that lie between the universal and the reduced group $C^{*}$ -algebra of a locally compact group. We consider simple Lie groups $G$ with…

math.KT2019

Strong Novikov conjecture for low degree cohomology and exotic group C*-algebras

Paolo Antonini, Alcides Buss, Alexander Engel +1

We strengthen a result of Hanke-Schick about the strong Novikov conjecture for low degree cohomology by showing that their non-vanishing result for the maximal group C*-algebra hol…