arXiv subjects

Emilie Mai Elkiær

Publications and source records attributed to Emilie Mai Elkiær.

4 recordsLinked to original sources

arXiv2024

Symmetrized pseudofunction algebras from $L^p$-representations and amenability of locally compact groups

We show via an application of techniques from complex interpolation theory how the $L^p$-pseudofunction algebras of a locally compact group $G$ can be understood as sitting between $L^1(G)$ and $C^*(G)$. Motivated by this, we collect and review various characterizations of group amenability connected to the $p$-pseudofunction algebra of Herz and generalize these to the symmetrized setting. Along the way, we describe the Banach space dual of the symmetrized pseudofuntion algebras on $G$ associated with representations on reflexive Banach spaces.

math.FA↗

arXiv2024

Property (T) for Banach algebras

We define and study the notion of property $(\rm T)$ for Banach algebras, generalizing the one from $C^*$-algebras. For a second countable locally compact group $G$ and a given family of Banach spaces $\mathcal E$, we prove that our Banach algebraic property $(\rm{T}_{\mathcal E})$ of the symmetrized pseudofunction algebras $F^*_{\mathcal E}(G)$ characterizes the Banach property $(\rm{T}_{\mathcal E})$ of Bader, Furman, Gelander and Monod for groups. In case $G$ is a discrete group and $\mathcal E$ is the class of $L^p$-spaces for $1\leq p < \infty$, we also achieve the analogue characterization using the symmetrized $p$-pseudofunction algebras $F^*_{λ_ p}(G)$.

math.FA↗

arXiv2024

Weak property $(\mathrm{T}_{L^p})$ for discrete groups

We show that, for a countable discrete group $Γ$, property $(\mathrm{T}_{L^p})$ of Bader, Furman, Gelander and Monod is equivalent to the property that, whenever an $L^p$-representation of $Γ$ admits a net of almost invariant unit vectors, it has a non-zero invariant vector. Central in the proof is to show that the closure of the group of $\mathbb{T}$-valued $1$-coboundaries is a sufficient criteria for strong ergodicity of ergodic p.m.p. actions.

math.FA↗

arXiv2023

Unitary $L^{p+}$-representations of almost automorphism groups

Let $G$ be a locally compact group with an open subgroup $H$ with the Kunze-Stein property, and let $π$ be a unitary representation of $H$. We show that the representation $\widetildeπ$ of $G$ induced from $π$ is an $L^{p+}$-representation if and only if $π$ is an $L^{p+}$-representation. We deduce the following consequence for a large natural class of almost automorphism groups $G$ of trees: For every $p \in (2,\infty)$, the group $G$ has a unitary $L^{p+}$-representation that is not an $L^{q+}$-representation for any $q < p$. This in particular applies to the Neretin groups.

math.RT↗