Stratified Superintegrability of Spin Calogero-Moser-Sutherland Systems

Abstract

We study the Poisson chain of the compact spin Calogero-Moser-Sutherland system obtained by conjugation reduction of $T^*\mathrm{SU}(n)$ at a fixed coadjoint orbit. We give a Horn-type condition ensuring that the spectral torus acts freely on the full fiber over a simple spectrum; for each orbit, the admissible spectra form a nonempty open dense set, and the restricted chain is strongly superintegrable of rank $n-1$ on every orbit-type stratum. We also construct, across certain affine spectral walls, a proper quotient map onto a Hausdorff stratified Poisson space with a finite Whitney stratification. For $\mathrm{SU}(3)$, we compute the free spectral domain and the quotient near two intersecting walls, and a zero-orbit example shows that the analogous quotient need not be Hausdorff on the unrestricted reduced phase space.