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Study of curvature properties of Kenmotsu manifolds concern to a type of semi-symmetric ono-metric connection

Sundriyal Shivani, Upreti Jaya

Fasciculi Mathematici

2024

nr 67

81--93

In the present paper we study Riemannian curvature tensor, projective, Wely conformal and con-harmonic curvature tensors on Kenmotsu manifolds along with a type of semi-symmetric non-metric connection. Also, we deduce some results for cyclic and η-parallel Ricci tensors. In the end, we give an example to validate some of the obtained results.

On D-homothetic deformation of trans-Sasakian structure

Shaikh A., Baishya K., Eyasmin S.

Demonstratio Mathematica

2008

Vol. 41, nr 1

171-188

The object of the present paper is to study a transformation called D-homothetic deformation of trans-Sasakian structure. Among others it is shown that in a trans-Sasakian manifold, the Ricci operator Q does not commute with the structure tensor phi and the operator Qphi - phiQ is conformal under a D-homothetic deformation. Also the phi-sectional curvature of a trans-Sasakian manifold is conformal under such a deformation. Some non-trivial examples of trans-Sasakian (non-Sasakian) manifolds with global vector fields are obtained.