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Curvature Invariants of Statistical Submanifolds in Kenmotsu Statistical Manifolds of Constant ϕ-Sectional Curvature [PDF]

open access: yesEntropy, 2018
In this article, we consider statistical submanifolds of Kenmotsu statistical manifolds of constant ϕ-sectional curvature. For such submanifold, we investigate curvature properties. We establish some inequalities involving the normalized δ-Casorati
Simona Decu   +3 more
doaj   +3 more sources

Holomorphic Sectional Curvature of Complex Finsler Manifolds. [PDF]

open access: yesJ Geom Anal, 2019
In this paper, we get an inequality in terms of holomorphic sectional curvature of complex Finsler metrics. As applications, we prove a Schwarz Lemma from a complete Riemannian manifold to a complex Finsler manifold.
Wan X.
europepmc   +3 more sources

On the sectional curvature of lightlike submanifolds [PDF]

open access: yesJournal of Inequalities and Applications, 2016
The main purpose of this paper is to show how to obtain rigidity theorems with the help of curvature invariants in submanifolds of a semi-Riemannian manifold.
Erol Kılıç, Mehmet Gülbahar
doaj   +3 more sources

Sectional curvature and Weitzenbock formulae [PDF]

open access: yesIndiana University Mathematics Journal, 2017
We establish a new algebraic characterization of sectional curvature bounds $\sec\geq k$ and $\sec\leq k$ using only curvature terms in the Weitzenbock formulae for symmetric $p$-tensors. By introducing a symmetric analogue of the Kulkarni-Nomizu product,
R. G. Bettiol, R. Mendes
semanticscholar   +4 more sources

On the Sectional Curvature of Compact Hypersurfaces [PDF]

open access: bronzeProceedings of the American Mathematical Society, 1990
We establish a sufficient condition for compact hypersurfaces of a complete riemannian manifold to be spherical. It is well known, from the works of Jacobowitz, Jorge and Koutroufiotis, and others, that the maximum sectional curvature of such hypersurfaces can be estimated from the curvature of the ambient space and the outer radius.
Leslie Coghlan, Yoe Itokawa
openalex   +3 more sources

Chern-Ricci curvatures, holomorphic sectional curvature and Hermitian metrics [PDF]

open access: yesScience China Mathematics, 2019
We present some formulae related to the Chern-Ricci curvatures and scalar curvatures of special Hermitian metrics. We prove that a compact locally conformal Kähler manifold with constant nonpositive holomorphic sectional curvature is Kähler. We also give
Haojie Chen, Lin Chen, Xiaolan Nie
semanticscholar   +5 more sources

Sectional Curvature in Riemannian Manifolds

open access: yesThe Mathematica Journal, 2020
The metric structure on a Riemannian or pseudo-Riemannian manifold is entirely determined by its metric tensor, which has a matrix representation in any given chart.
B. Healy   +2 more
semanticscholar   +2 more sources

Remarks on symplectic sectional curvature [PDF]

open access: yesDifferential Geometry and its Applications, 2016
In [11], I. M. Gelfand, V. Retakh, and M. Shubin defined the symplectic sectional curvature of a torsion-free connection preserving a symplectic form. The present article defines the corresponding notion of constant symplectic sectional curvature and characterizes this notion in terms of the curvature tensor of the symplectic connection and its ...
Daniel J. F. Fox
semanticscholar   +4 more sources

Positive weighted sectional curvature [PDF]

open access: yesIndiana University Mathematics Journal, 2014
In this paper, we give a new generalization of positive sectional curvature called positive weighted sectional curvature. It depends on a choice of Riemannian metric and a smooth vector field.
Lee Kennard, W. Wylie
semanticscholar   +5 more sources

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