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Certain curvature conditions on an LP-Sasakian manifold with a coefficient α

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The object of the present paper is to study certain curvature restriction on an LP-Sasakian manifold with a coefficient α. Among others it is shown that if an LP-Sasakian manifold with a coefficient α is a manifold of constant curvature, then the manifold is the product manifold. Also it is proved that a 3-dimensional Ricci semisymmetric LP-Sasakian manifold with a constant coefficient α is a spaceform.

Abstract

The object of the present paper is to study certain curvature restriction on an LP-Sasakian manifold with a coefficient α. Among others it is shown that if an LP-Sasakian manifold with a coefficient α is a manifold of constant curvature, then the manifold is the product manifold. Also it is proved that a 3-dimensional Ricci semisymmetric LP-Sasakian manifold with a constant coefficient α is a spaceform.

참고문헌 (9)

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  2. F. Brickell, "Differentiable Manifold" (1978), Van Nostrand Reinhold Comp
  3. U. D. DE, "On LP-Sasakian Manifolds with a Coefficient α", Kyungpook Mathematical Journal, 42(1), pp.177~186 (2002), 경북대학교 자연과학대학 수학과
  4. T. Ikawa, "Sasakian manifolds with Lorentzian metric", Kyungpook Math. J., 35(3), pp.517~526 (1996), Special Issue
  5. T. Ikawa, "On sectional curvatures of a normal contact Lorentzian manifold", Korean J. Math. Sci., 4, pp.27~33 (1997)
  6. K. Matsumoto, "On Lorentzian paracontact manifolds", Bull. Yamagata Univ. Natur. Sci, 12(2), pp.151~156 (1989)
  7. I. Mihai, "On Lorentzian P-Sasakian manifolds, Classical analysis", pp.155~169 (1992), World Sci. Publ., River Edge
  8. L. Verstraelen, "Comments on pseudo-symmetry in the sense of Ryszard Deszcz, Geometry and topology of submanifolds, VI", pp.199~209 (1994), World Sci. Publ., River Edge
  9. K. Yano, "On the torse-forming directions in Riemannian spaces", Proc. Imp. Acad. Tokyo, 20, pp.340~345 (1944)

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