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arXiv · 2111.02835

Unitary representations of locally compact groups as metric structures

Itaï Ben Yaacov·Isaac Goldbring
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Abstract

For a locally compact group $G$, we show that it is possible to present the class of continuous unitary representations of $G$ as an elementary class of metric structures, in the sense of continuous logic. More precisely, we show how non-degenerate $*$-representations of a general $*$-algebra $A$ (with some mild assumptions) can be viewed as an elementary class, in a many-sorted language, and use the correspondence between continuous unitary representations of $G$ and non-degenerate $*$-representations of $L^1(G)$. We relate the notion of ultraproduct of logical structures, under this presentation, with other notions of ultraproduct of representations appearing in the literature, and characterise property (T) for $G$ in terms of the definability of the sets of fixed points of $L^1$ functions on $G$.

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Itaï Ben Yaacov, Isaac Goldbring. 2021-11-04. Unitary representations of locally compact groups as metric structures. https://arxiv.org/abs/2111.02835

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