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arxiv: 2606.10105 · v1 · pith:HNBOQ3PLnew · submitted 2026-06-08 · 🧮 math.OA

Amenable absorption in von Neumann algebras of hyperbolic groups

classification 🧮 math.OA
keywords amenablegroupshyperbolicabsorptionneumannclassmathcalsubset
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We prove that the von Neumann algebra $\cL(G)$ associated with any hyperbolic group $G$ satisfies the following \emph{amenable absorption property}: for any infinite maximal amenable subgroup $H \leqslant G$ and any amenable von Neumann subalgebra $\mathcal{Q} \subset \cL(G)$ with diffuse intersection with $\cL(H)$, one must have $\mathcal{Q} \subset \cL(H)$. This strengthens a result of Boutonnet and Carderi \cite{BC2}. We also establish similar amenable absorption results for the broader class of acylindrically hyperbolic groups, including relatively hyperbolic groups, mapping class groups, and limit groups.

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