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- W4318621076 abstract "We consider the notion of strong self-absorption for continuous actions of locally compact groups on the hyperfinite II$_1$-factor and characterize when such an action is tensorially absorbed by another given action on any separably acting von Neumann algebra. This extends the well-known McDuff property for von Neumann algebras and is analogous to the core theorems around strongly self-absorbing C$^*$-dynamics. Given a countable discrete group $G$ and an amenable action $Gcurvearrowright M$ on any separably acting semi-finite von Neumann algebra, we establish a type of measurable local-to-global principle: If a given strongly self-absorbing $G$-action is suitably absorbed at the level of each fibre in the direct integral decomposition of $M$, then it is tensorially absorbed by the action on $M$. As a direct application of Ocneanu's theorem, we deduce that if $M$ has the McDuff property, then every amenable $G$-action on $M$ has the equivariant McDuff property, regardless whether $M$ is assumed to be injective or not. By employing Tomita-Takesaki theory, we can extend the latter result to the general case where $M$ is not assumed to be semi-finite." @default.
- W4318621076 created "2023-01-31" @default.
- W4318621076 creator A5044546569 @default.
- W4318621076 creator A5049960571 @default.
- W4318621076 date "2023-01-27" @default.
- W4318621076 modified "2023-09-25" @default.
- W4318621076 title "Dynamical McDuff-type properties for group actions on von Neumann algebras" @default.
- W4318621076 doi "https://doi.org/10.48550/arxiv.2301.11748" @default.
- W4318621076 hasPublicationYear "2023" @default.
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