S. Echterhoff

activity

19942024

most citedA Categorical Approach to Imprimitivity Theorems for C*-Dynamical Systems

47 citations · 303 across the 41 of their papers we have counts for

collaborators

47 papers

math.OA2024

Deformation of Fell bundles

Alcides Buss, Siegfried Echterhoff

In this paper we study deformations of $C^{*}$ -algebras that are given as cross-sectional $C^{*}$ -algebras of Fell bundles over locally compact groups $G$ . Our deformation comes from a…

math.OA2023

A new approach to deformation of C*-algebras via coactions

Alcides Buss, Siegfried Echterhoff

We revisit the procedure of deformation of $C^{*}$ -algebras via coactions of locally compact groups and extend the methods to cover deformations for maximal, reduced, and exotic coac…

math.OA2022

$K$ -theory of non-commutative Bernoulli Shifts

Sayan Chakraborty, Siegfried Echterhoff, Julian Kranz +1

For a large class of C*-algebras $A$ , we calculate the $K$ -theory of reduced crossed products $A^{\otimes G} ⋊_{r} G$ of Bernoulli shifts by groups satisfying the Baum--Connes co…

math.OA2021★ 1 cited

Inclusions of $C^{*}$ -algebras arising from fixed-point algebras

Siegfried Echterhoff, Mikael Rørdam

We examine inclusions of $C^{*}$ -algebras of the form $A^{H} \subseteq A ⋊_{r} G$ , where $G$ and $H$ are groups acting on a unital simple $C^{*}$ -algebra $A$ by outer automorphisms…

math.RT2020

On unitary representations of algebraic groups over local fields

Bachir Bekka, Siegfried Echterhoff

Let $G$ be an algebraic group over a local field $k$ of characteristic zero. We show that the locally compact group $G (k)$ consisting of the $\math…

math.OA2020★ 8 cited

Amenability and weak containment for actions of locally compact groups on $C^{*}$ -algebras

Alcides Buss, Siegfried Echterhoff, Rufus Willett

In this work we introduce and study a new notion of amenability for actions of locally compact groups on $C^{*}$ -algebras. Our definition extends the definition of amenability for ac…