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Covariant Derivative of the Curvature Tensor of Kenmotsu Manifolds
Bulletin of the Iranian Mathematical Society ( IF 0.7 ) Pub Date : 2021-02-09 , DOI: 10.1007/s41980-020-00497-0
Vahid Pirhadi

In this paper, we define a (1, 3)-tensor field T(XY)Z on Kenmotsu manifolds and give a necessary and sufficient condition for T to be a curvature-like tensor. Next, we present some properties related to the curvature-like tensor T and prove that \(M^{2m+1}\) is an \(\eta \)-Einstein–Kenmotsu manifold if and only if \(\sum ^{m}_{j=1}T( \varphi (e_j), e_j) X = 0\). Besides, we define a (1, 4)-tensor field t on the Kenmotsu manifold M which determines when M is a Chaki T-pseudo-symmetric manifold. Then, we obtain a formula for the covariant derivative of the curvature tensor of Kenmotsu manifold M. We also find some conditions under which an \(\eta \)-Einstein–Kenmotsu manifold is a Chaki T-pseudo-symmetric. Finally, we give an example to verify our results and prove that every three-dimensional Kenmotsu manifold is a generalized pseudo-symmetric manifold.



中文翻译:

Kenmotsu流形的曲率张量的协变导数

在本文中,我们在Kenmotsu流形上定义了(1,3)张量场TX,  YZ,并给出了使T成为曲率张量的充要条件。接下来,我们介绍一些与曲率张量T相关的性质,并证明\(M ^ {2m + 1} \)\(\ eta \)- Einstein–Kenmotsu流形,当且仅当\(\ sum ^ {m} _ {j = 1} T(\ varphi(e_j),e_j)X = 0 \)。此外,我们在Kenmotsu流形M上定义了(1,4)张量场t,它确定M何时是Chaki T-伪对称流形。然后,我们获得了Kenmotsu流形M曲率张量的协变量导数的公式。我们还找到了一些条件,其中\(\ eta \)- Einstein–Kenmotsu流形是Chaki T-伪对称。最后,我们给出一个例子来验证我们的结果,并证明每个三维Kenmotsu流形都是广义的伪对称流形。

更新日期:2021-02-09
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