Sunil Kumar Srivastava and Vibhawari Srivastava
TIn this paper we have shown that Lorentzian α−Sasakian manifold are
Einstein manifold if they satisfy the condition R(X, Y ).S = 0, C(ξ, X).S = 0,
C(ξ, X).C = 0, C(ξ, X).R = 0, R.C = R.R and ϕ^2 ((DXQ)(Y )) = 0.
Keywords and Phrases :: Lorentzian α−Sasakian manifold, Concircular curvature tensor, Einstien manifold
AMS Subject Classification : : 53C25.
Received date : November 27, 2012
Accepted date: February 12, 2013
cited by: J.T.S. Vol. 7 (2013), pp.9-16