The converse Haagerup-property conjecture for locally compact wreath products

Let BAB\leq A be locally compact groups, let HH act on a set XX, and suppose that all point stabilizers are commensurated subgroups of HH, with ABA\neq B. Write BXAHB\wr^A_X H for the corresponding permutational restricted wreath product, and for a point stabilizer LL write HLH\rightthreetimes L for the relative profinite completion.

Converse Haagerup-property conjecture. If BXAHB\wr^A_X H has the Haagerup Property, then for every point stabilizer LL of XX, the relative profinite completion HLH\rightthreetimes L has the Haagerup Property.

This is proposed as the converse of the theorem giving sufficient conditions for the Haagerup Property of the wreath product. The source does not provide evidence of a resolution.

Sources & referencesView supporting material

Primary source

Yves Cornulier, “Locally compact wreath products”, arXiv:1703.08880 (2018).

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