
doi: 10.2298/pim1817113m
In the last paper, we introduced a new curvaturlike tensor field in an almost contact Riemannian manifold and we showed some geometrical properties of this tensor field in a Kenmotsu and a Sasakian manifold. In this paper, we define another new curvaturelike tensor field, named (CHR)3-curvature tensor in an almost contact Riemannian manifold which is called a contact holomorphic Riemannian curvature tensor of the second type. Then, using this tensor, we mainly research (CHR)3-curvature tensor in a Sasakian manifold. Then we define the notion of the flatness of a (CHR)3-curvature tensor and we show that a Sasakian manifold with a flat (CHR)3-curvature tensor is flat. Next, we introduce the notion of (CHR)3-?-Einstein in an almost contact Riemannian manifold. In particular, we show that Sasakian (CHR)3- ?-Einstein manifold is ?-Einstain. Moreover, we define the notion of (CHR)3- space form and consider this in a Sasakian manifold. Finally, we consider a conformal transformation of an almost contact Riemannian manifold and we get new invariant tensor fields (not the conformal curvature tensor) under this transformation. Finally, we prove that a conformally (CHR)3-flat Sasakian manifold does not exist.
Special Riemannian manifolds (Einstein, Sasakian, etc.), almost contact Riemannian manifold, Global submanifolds, Contact manifolds (general theory), curvature-like tensor field, \((\mathrm{CHR})_3\)-curvature tensor, Sasakian manifold
Special Riemannian manifolds (Einstein, Sasakian, etc.), almost contact Riemannian manifold, Global submanifolds, Contact manifolds (general theory), curvature-like tensor field, \((\mathrm{CHR})_3\)-curvature tensor, Sasakian manifold
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