J. Korean Math. Soc. 2002; 39(6): 953-961
Printed November 1, 2002
Copyright © The Korean Mathematical Society.
Jeong-Sik Kim, Rajendra Prasad, and Mukut Mani Tripathi
Sunchon National University, Allahabad University, Department of Mathematics and Astronomy
Generalized Ricci-recurrent trans-Sasakian manifolds are studied. Among others, it is proved that a generalized Ricci-recurrent cosymplectic manifold is always recurrent. Generalized Ricci-recurrent trans-Sasakian manifolds of dimension $\geq 5$ are locally classified. It is also proved that if $M$ is one of Sasakian, $\alpha $-Sasakian, Kenmotsu or $\beta $-Kenmotsu manifolds, which is generalized Ricci-recurrent with cyclic Ricci tensor and non-zero $A\left( \xi \right) $ everywhere; then $M$ is an Einstein manifold.
Keywords: Sasakian, $\alpha $-Sasakian, Kenmotsu, $\beta $-Kenmotsu, $f$-Kenmotsu, cosymplectic and trans-Sasakian structures, Ricci-recurrent, generalized Ricci-recurrent and Einstein manifolds.
MSC numbers: Primary 53C25
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