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<p>The aim of the present paper is to study the orbits of the isotropy group action on an irreducible Hermitian symmetric space of compact type. Specifically, we examine the properties of these orbits as <i>CR</i> 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 determine Sasaki–Einstein orbits.</p>

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Sasaki–Einstein orbits in compact Hermitian symmetric spaces

  • 期刊论文

  • 发表日期：

    2025年6月26日

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  • Yuuki Sasaki

摘要

The aim of the present paper is to study the orbits of the isotropy group action on an irreducible Hermitian symmetric space of compact type. Specifically, we examine the properties of these orbits as 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 determine Sasaki–Einstein orbits.