Multiplier Hopf algebras imbedded in C$^*$-algebraic quantum groups

Details Multiplier Hopf algebras imbedded in C$^*$-algebraic quantum groups Multiplier Hopf algebras imbedded in C$^*$-algebraic quantum groups

2006-11-28

arxiv.org/abs/math/0611872v2

Mathematics

Operator Algebras

Scientific paper

Let $(A,\Delta)$ be a locally compact quantum group and $(A_0,\Delta_0)$ a regular multiplier Hopf algebra. We show that if $(A_0,\Delta_0)$ can in some sense be imbedded in $(A,\Delta)$, then $A_0$ will inherit some of the analytic structure of $A$. Under certain conditions on the imbedding, we will be able to conclude that $(A_0,\Delta_0)$ is actually an algebraic quantum group with a full analytic structure. The techniques used to show this, can be applied to obtain the analytic structure of a $^*$-algebraic quantum group {\it in a purely algebraic fashion}. Moreover, the {\it reason} that this analytic structure exists at all, is that the one-parameter groups, such as the modular group and the scaling group, are diagonizable. In particular, we will show that necessarily the scaling constant $\mu$ of a $^*$-algebraic quantum group equals 1. This solves an open problem.

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