The similarity-degree conjecture for Fourier algebras

Let GG be a locally compact group. Write A~(G)1\widetilde{\mathrm{A}}(G)_1 for the unit ball of the unitization of the Fourier algebra A(G)\mathrm{A}(G), let C0(G)\mathcal{C}_0(G) denote the algebra of continuous functions vanishing at infinity, and let dcb(A(G))d_{\mathrm{cb}}(\mathrm{A}(G)) be the completely bounded similarity degree of A(G)\mathrm{A}(G). Similarity-degree conjecture. For every locally compact group, one has

A~(G)1C0(G)anddcb(A(G))2.\widetilde{\mathrm{A}}(G)_1\cong\mathcal{C}_0(G)\quad\text{and}\quad d_{\mathrm{cb}}(\mathrm{A}(G))\leq 2.

The claim gives a uniform upper bound on the completely bounded similarity degree of Fourier algebras and identifies the relevant unitized object with C0(G)\mathcal{C}_0(G). The supplied text does not indicate whether this assertion is established or remains open.

Sources & referencesView supporting material

Primary source

Hun Hee Lee, Ebrahim Samei and Nico Spronk, “Similarity degree of Fourier algebras”, arXiv:1511.03423 (2016).

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