$\mathcal{W}$-absorbing actions of finite groups on the Razak-Jacelon algebra

TL;DR

This paper classifies outer finite group actions on the Razak-Jacelon algebra that are alW-absorbing, providing a complete understanding of their conjugacy and cocycle conjugacy classes.

Contribution

It offers a complete classification of outer alW-absorbing actions of finite groups on the Razak-Jacelon algebra, a significant step in understanding their structure.

Findings

Complete classification of outer alW-absorbing actions

Results on conjugacy and cocycle conjugacy classes

Advances understanding of group actions on alW

Abstract

We say that a countable discrete group action $\alpha$ on a C$^*$-algebra $A$ is \textit{$\mathcal{W}$-absorbing} if there exist a C$^*$-algebra $B$ and an action $\beta$ on $B$ such that $\alpha$ is cocycle conjugate to $\beta\otimes \mathrm{id}_{\mathcal{W}}$ on $B\otimes \mathcal{W}$ where $\mathcal{W}$ is the Razak-Jacelon algebra. In this paper, we completely classify outer $\mathcal{W}$-absorbing actions of finite groups on $\mathcal{W}$ up to conjugacy and cocycle conjugacy.