Eberlein oligomorphic groups

Itaï Ben Yaacov; Tomás Ibarlucía; Todor Tsankov

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arXiv · 1602.05097

Eberlein oligomorphic groups

Itaï Ben Yaacov·Tomás Ibarlucía·Todor Tsankov

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Abstract

We study the Fourier--Stieltjes algebra of Roelcke precompact, non-archimedean, Polish groups and give a model-theoretic description of the Hilbert compactification of these groups. We characterize the family of such groups whose Fourier--Stieltjes algebra is dense in the algebra of weakly almost periodic functions: those are exactly the automorphism groups of $\aleph_0$-stable, $\aleph_0$-categorical structures. This analysis is then extended to all semitopological semigroup compactifications $S$ of such a group: $S$ is Hilbert-representable if and only if it is an inverse semigroup. We also show that every factor of the Hilbert compactification is Hilbert-representable.

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BibTeX RIS

Itaï Ben Yaacov, Tomás Ibarlucía, Todor Tsankov. 2016-02-16. Eberlein oligomorphic groups. https://arxiv.org/abs/1602.05097

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