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Second Order Parallel Tensor on Almost Kenmotsu Manifolds

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Let M be an almost Kenmotsu manifold of dimension 2n + 1 having nonvanishing ξ-sectional curvature such that trℓ > −2n − 2. We prove that any second order parallel tensor on M is a constant multiple of the associated metric tensor and obtained some consequences of this. Vector fields keeping curvature tensor invariant are characterized on M.

Abstract

Let M be an almost Kenmotsu manifold of dimension 2n + 1 having nonvanishing ξ-sectional curvature such that trℓ > −2n − 2. We prove that any second order parallel tensor on M is a constant multiple of the associated metric tensor and obtained some consequences of this. Vector fields keeping curvature tensor invariant are characterized on M.

참고문헌 (34)

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