From Quantum Groups to Groups

Details From Quantum Groups to Groups From Quantum Groups to Groups

2011-10-24

arxiv.org/abs/1110.5129v1

Mathematics

Operator Algebras

19 pages

Scientific paper

In this paper we use the recent developments in the representation theory of locally compact quantum groups, to assign, to each locally compact quantum group $\mathbb{G}$, a locally compact group $\tilde \mathbb{G}$ which is the quantum version of point-masses, and is an invariant for the latter. We show that "quantum point-masses" can be identified with several other locally compact groups that can be naturally assigned to the quantum group $\mathbb{G}$. This assignment preserves compactness as well as discreteness (hence also finiteness), and for large classes of quantum groups, amenability. We calculate this invariant for some of the most well-known examples of non-classical quantum groups. Also, we show that several structural properties of $\mathbb{G}$ are encoded by $\tilde \mathbb{G}$: the latter, despite being a simpler object, can carry very important information about $\mathbb{G}$.

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