Weak containment and conjugate subgroups of the Bohr compactification

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Let GG be a finitely generated group. Let G↷πHG \curvearrowright^\pi \mathcal{H} be an orthogonal representation, and let G↷π′H′G \curvearrowright^{\pi'} \mathcal{H}' be an irreducible orthogonal representation. Write bHb\mathcal{H} and bH′b\mathcal{H}' for the Bohr compactifications associated with these representations. Weak-containment conjecture. The representation π\pi weakly contains π′\pi' if and only if there is a closed, GG-invariant subgroup K⊆bHK \subseteq b\mathcal{H} such that the topological algebraic actions G↷KG \curvearrowright K and G↷bH′G \curvearrowright b\mathcal{H}' are conjugate. This proposes that the Bohr compactification records precisely the weakly contained irreducible representations, extending the preceding result in one direction; the question is left open for future research.

References

Primary source

Zachary Chase, Wade Hann-Caruthers and Omer Tamuz, “Additive Conjugacy and the Bohr Compactification of Orthogonal Representations”, arXiv:1905.11599 (2021).

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