A Note on Nearly Sasakian Manifolds

A class of nearly Sasakian manifolds is considered in this paper. We discuss the geometric effects some symmetries on such and show, under a certain condition, that Ricci semi-symmetric subclass Einstein manifolds. prove Codazzi-type space form either manifold with constant ϕ-holomorphic sectional curvature H=1 or 5-dimensional proper H>1. also spectrum operator H2 generated by set simple eigenvalue 0 an multiplicity 4, we induce underlying carries Sasaki–Einstein structure. show there exist integrable distributions totally geodesic leaves same manifolds, are no forms curvature.