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Certain curvature characterizations of affine hypersurfaces

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Curvature properties of certain compact pseudosymmetric manifolds

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EN
We prove that every generalized Cartan hypersurface satisfies the so called Roter type equation. Using this fact, we construct a particular class of generalized Robertson-Walker spacetimes.
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A note on geodesic mappings of pseudosymmetric Riemannian manifolds

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Curvature properties of Cartan hypersurfaces

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On some class of pseudosymmetric warped products

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We present curvature properties of pseudosymmetry type of some warped products of semi-Riemannian spaces of constant curvature.
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Examples of nonsemisymmetric Ricci-semisymmetric hypersurfaces

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We construct a class of nonsemisymmetric Ricci-semisymmetric warped products. Some manifolds of this class can be locally realized as hypersurfaces of a semi-Euclidean space $𝔼^{n+1}_{s}$, n ≥ 5.
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On the equivalence of the Ricci-pseudosymmetry and pseudosymmetry

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Quasi-Einstein hypersurfaces in semi-Riemannian space forms

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We investigate curvature properties of hypersurfaces of a semi-Riemannian space form satisfying R·C = LQ(S,C), which is a curvature condition of pseudosymmetry type. We prove that under some additional assumptions the ambient space of such hypersurfaces must be semi-Euclidean and that they are quasi-Einstein Ricci-semisymmetric manifolds.
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On the equivalence of Ricci-semisymmetry and semisymmetry

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EN
Solutions of the P. J. Ryan problem as well as investigations of curvature properties of Cartan hypersurfaces and Ricci-pseudosymmetric hypersurfaces lead to curvature identities holding on every hypersurface M isometrically immersed in a semi-Riemannian space form. These identities, under some assumptions, give rises to new generalized Einstein metric conditions on M. We investigate hypersurfaces satisfying such curvature conditions.
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On pseudosymmetric para-Kähler manifolds

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On Weyl pseudosymmetric hypersurfaces

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We investigate semi-Riemannian manifolds with pseudosymmetric Weyl curvature tensor satisfying some additional condition imposed on their curvature tensor. Among other things we prove that the so-called Roter type equation holds on such manifolds. We present applications of our results to hypersurfaces in semi-Riemannian space forms, as well as to 4-dimensional warped products.
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On some type of curvature conditions

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In this paper we present a review of recent results on semi-Riemannian manifolds satisfying curvature conditions of pseudosymmetry type.
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