Title of article :
On nearly Kenmotsu manifolds
Author/Authors :
NAJAFI, Behzad shahed university - Faculty of Science - Department of Mathematics, تهران, ايران , HOSSEINPOUR KASHANI, Niloufar shahed university - Faculty of Science - Department of Mathematics, تهران, ايران
Abstract :
We prove that on a nearly Kenmotsu manifold a second-order symmetric closed recurrent tensor is a multiple of the associated metric tensor. We then find the necessary condition under which a vector field on a nearly Kenmotsu manifold will be a strict contact or Killing vector field. Finally, we prove that every phi-recurrent nearly Kenmotsu manifold is an Einstein manifold and every locally phi-recurrent nearly Kenmotsu manifold is a manifold of constant curvature -1 .
Keywords :
Almost contact metric , Kenmotsu manifold , nearly Kenmotsu manifold
Journal title :
Turkish Journal of Mathematics
Journal title :
Turkish Journal of Mathematics