Real group orbits on flag ind-varieties of $\mathrm{SL}(\infty ,\mathbb{C})$

Abstract

We consider the complex ind-group $G=\mathrm{SL}(\infty ,\mathbb{C})$ and its real forms $G^0=\mathrm{SU}(\infty ,\infty )$, $\mathrm{SU}(p,\infty )$, $\mathrm{SL}(\infty ,\mathbb{R})$, $\mathrm{SL}(\infty ,\mathbb{H})$. Our main objects of study are the $G^0$-orbits on an ind-variety $G/P$ for an arbitrary splitting parabolic ind-subgroup $P\subset G$. We prove that the intersection of any $G^0$-orbit on $G/P$ with a finite-dimensional flag variety $G_n/P_n$ from a given exhaustion of $G/P$ via $G_n/P_n$ for $n\to \infty$, is a single $(G^0\cap G_n)$-orbit. We also characterize all ind-varieties $G/P$ on which there are finitely many $G^0$-orbits, and provide criteria for the existence of open and closed $G^0$-orbits on $G/P$ in the case of infinitely many $G^0$-orbits.

Corollary 5.7 is adjusted, an example is added to explain the adjustment, and some misprints are corrected

References in corpus (1)

• Geometry of the Borel -- de Siebenthal Discrete Series