Timo Siebenand
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View article: Partial tensor-product functors and crossed-product functors
Partial tensor-product functors and crossed-product functors Open
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 correspondence crossed-product functor and the maximal injective cr…
View article: Strong Novikov conjecture for low degree cohomology and exotic group C*-algebras
Strong Novikov conjecture for low degree cohomology and exotic group C*-algebras Open
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 holds for many other exotic group C*-algebras, in particular t…
View article: Group $C^*$-algebras of locally compact groups acting on trees
Group $C^*$-algebras of locally compact groups acting on trees Open
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 $G$ acting on (semi-)homogeneous trees of sufficiently larg…
View article: On the ideal structure of the Fourier-Stieltjes algebra of certain groups
On the ideal structure of the Fourier-Stieltjes algebra of certain groups Open
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 groups to which this applies are groups whose only irreducible…