On the existence of regular vectors

Let $G$ be a locally convex Lie group and $π:G \to \mathrm{U}(\mathcal{H})$ be a continuous unitary representation. $π$ is called smooth if the space of $π$-smooth vectors $\mathcal{H}^\infty\subset \mathcal{H}$ is dense. In this article we show that under certain conditions, concerning in particular the structure of the Lie algebra $\mathfrak{g}$ of $G$, a continuous unitary representation of $G$ is automatically smooth. As an application, this yields a dense space of smooth vectors for continuous positive energy representations of oscillator groups, double extensions of loop groups and the Virasoro group. Moreover we show the existence of a dense space of analytic vectors for the class of semibounded representations of Banach-Lie groups. Here $π$ is called semibounded, if $π$ is smooth and there exists a non-empty open subset $U\subset\mathfrak{g}$ such that the operators $i\mathrm{d}π(x)$ from the derived representation are uniformly bounded from above for $x\in U$.

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