Invariant quantum measure on $q$-deformed twisted adjoint orbits

Abstract

Let $U$ be a compact semisimple Lie group with complexification $G$ and associated Cartan involution $\Theta$. Let $\nu$ be an involutive complex Lie group automorphism of $G$ commuting with $\Theta$, and consider the associated semisimple real Lie group $G_{\nu} = \{g\in G\mid \nu(g) = \Theta(g)\}$. We consider $q$-deformed analogues of the $U$-orbits of the quotient space $G_{\nu}\backslash G$, and determine for these the associated von Neumann algebra and invariant state.