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Subalgebras, subgroups, and singularity (2208.06019v3)

Published 11 Aug 2022 in math.OA, math.DS, and math.GR

Abstract: This paper concerns the non-commutative analog of the Normal Subgroup Theorem for certain groups. Inspired by Kalantar-Panagopoulos, we show that all $\Gamma$-invariant subalgebras of $L\Gamma$ and $C*_r(\Gamma)$ are ($\Gamma$-) co-amenable. The groups we work with satisfy a singularity phenomenon described in Bader-Boutonnet-Houdayer-Peterson. The setup of singularity allows us to obtain a description of $\Gamma$-invariant intermediate von Neumann subalgebras $L{\infty}(X,\xi)\subset\mathcal{M}\subset L{\infty}(X,\xi)\rtimes\Gamma$ in terms of the normal subgroups of $\Gamma$.

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