Bachir Bekka

activity

20182025

most citedQuasi-regular representations of discrete groups and associated C*-algebras

10 citations · 12 across the 7 of their papers we have counts for

collaborators

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3 papers · 1 filter

math.OA2020

The Plancherel formula for countable groups

Bachir Bekka

We discuss a Plancherel formula for countable groups, which provides a canonical decomposition of the regular representation of such a group $Γ$ into a direct integral of factor re…

math.OA2018

Infinite characters on $G L_{n} (Q)$ , on $S L_{n} (Z),$ and on groups acting on trees

Bachir Bekka

Answering a question of J. Rosenberg, we construct the first examples of infinite characters on $G L_{n} (K)$ for a global field $K$ and $n \geq 2.$ The case $n = 2$ is…

math.OA2018

Property (T) for locally compact groups and C*-algebras

Bachir Bekka, Chi-Keung Ng

Let $G$ be a locally compact group and let $C^{*} (G)$ and $C_{r}^{*} (G)$ be the full group $C^{*}$ -algebra and the reduced group $C^{*}$ -algebra of $G$ . We investigate the relationship betwe…

The Plancherel formula for countable groups

Infinite characters on GLn​(Q), on SLn​(Z), and on groups acting on trees

Property (T) for locally compact groups and C*-algebras

Infinite characters on $G L_{n} (Q)$ , on $S L_{n} (Z),$ and on groups acting on trees