2025/04/15 by Yuuki Sasaki, Sasaki, Yuuki
Mathematics · #53C25 #53C35 #53C40 #53C55 #Advanced Algebra and Geometry #Differential Geometry (math.DG) #FOS: Mathematics #Geometric Analysis and Curvature Flows #Geometry and complex manifolds
paper · pdf · doi:10.48550/arxiv.2504.10935
openalex publication_date 2025/04/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The aim of the present papar is to study the orbits of the isotropy gourp action on an irreducible Hermitian symmetric space of compact type. Specifically, we examine the properties of these orbits as \it CR submanifolds of a Kähler manifold. Our focus is on the leaves of the totally real distribution, and we investigate the properties of leaves as a Riemannian submanifold. In particular, we prove that any leaf is a totally geodesic submanifold of the orbit. Additionally, we explore the conditions under which each leaf becomes a totally geodesic submanifold of the ambient space. The integrability of the complex distribution is also studied. Moreover, we analyze a contact structure of orbits where the rank of the totally real distribution is 1. We obtain a classification of the orbits that possess either a contact structure or a Sasakian structure compatible with the complex structure on the ambient space. Furthermore, we classify those Sasaki orbits that are Einstein with respect to the induced metric. Specifically, we completely detemine Sasaki-Einstein orbits.