Almost Kenmotsu manifolds with a condition of η-parallelism |
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Authors: | Giulia Dileo Anna Maria Pastore |
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Institution: | aDipartimento di Matematica, Università di Bari, via E. Orabona 4, 70125 Bari, Italy |
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Abstract: | We consider almost Kenmotsu manifolds (M2n+1,φ,ξ,η,g) with η-parallel tensor h′=h○φ, 2h being the Lie derivative of the structure tensor φ with respect to the Reeb vector field ξ. We describe the Riemannian geometry of an integral submanifold of the distribution orthogonal to ξ, characterizing the CR-integrability of the structure. Under the additional condition ξh′=0, the almost Kenmotsu manifold is locally a warped product. Finally, some lightlike structures on M2n+1 are introduced and studied. |
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Keywords: | Almost Kenmotsu manifolds η -parallel structures Lightlike structures |
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