Classification of Four-Dimensional CR Submanifolds of the Homogenous Nearly Kähler S 3 × S 3 Which Almost Complex Distribution Is Almost Product Orthogonal on Itself

Nataša Djurdjević ()
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Nataša Djurdjević: Department of Mathematics and Physics, University of Belgrade-Faculty of Agriculture, 6 Nemanjina Street, 11080 Belgrade, Serbia

Mathematics, 2025, vol. 13, issue 16, 1-30

Abstract: The product manifold S 3 × S 3 , which belongs to the homogenous six-dimensional nearly Kähler manifolds, admits two structures, the almost complex structure J and the almost product structure P . The investigation of embeddings of different classes of CR submanifolds of S 3 × S 3 was started some time ago by investigating three-dimensional CR submanifolds. It resulted that the almost product structure P is very important for the study of CR submanifolds of S 3 × S 3 , since submanifolds characterized by different actions of the almost product structure on base vector fields often appear as a result of the study of some specific types of CR submanifolds. Therefore, the investigation of four-dimensional CR submanifolds of S 3 × S 3 is initiated in this article. The main result is the classification of four-dimensional CR submanifolds of S 3 × S 3 , whose almost complex distribution D 1 is almost product orthogonal on itself. First, it was proved that such submanifolds have a non-integrable almost complex distribution, and then it was proved that these submanifolds are locally product manifolds of curves and three-dimensional CR submanifolds of S 3 × S 3 of the same type, and they were therefore constructed in this way.

Keywords: almost product structure; almost complex distribution; totally real distribution; product submanifolds; CR submanifolds; nearly Kähler S3×S3; Riemannian manifolds; differentiable manifolds (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2025
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