Abstract:In this paper we prove Chen inequalities for submanifolds of real space forms endowed with a semi-symmetric metric connection, i.e., relations between the mean curvature associated with the semi-symmetric metric connection, scalar and sectional curvatures, Ricci curvatures and the sectional curvature of the ambient space. The equality cases are considered.
“…Many interesting results in this respect were obtained by many geometers (see, for instance, [1,2,3,4,5,6,7,9,11,12,13,15,17,18]). On the other hand, the classification of ideal submanifolds in space forms remains a very challenging problem.…”
Abstract. Roughly speaking, an ideal immersion of a Riemannian manifold into a real space form is an isometric immersion which produces the least possible amount of tension from the ambient space at each point of the submanifold. The main purpose of this paper is to completely classify all non-minimal ideal submanifolds of real space forms with type number ≤ 2.
“…Many interesting results in this respect were obtained by many geometers (see, for instance, [1,2,3,4,5,6,7,9,11,12,13,15,17,18]). On the other hand, the classification of ideal submanifolds in space forms remains a very challenging problem.…”
Abstract. Roughly speaking, an ideal immersion of a Riemannian manifold into a real space form is an isometric immersion which produces the least possible amount of tension from the ambient space at each point of the submanifold. The main purpose of this paper is to completely classify all non-minimal ideal submanifolds of real space forms with type number ≤ 2.
“…In [15,16], Mihai and Özgür established Chen inequalities for submanifolds of real, complex and Sasakian space forms endowed with semi-symmetric metric connections and in [17,18], Özgür and Murathan gave Chen inequalities for submanifolds of a locally conformal almost cosymplectic manifold and a cosymplectic space form endowed with semi-symmetric metric connections. On the other hand, Lee et al proved inequalities involving the Casorati curvature of submanifolds in real, complex and Sasakian space forms endowed with a semi-symmetric metric connection in [7,8].…”
By using new algebraic techniques, two Casorati inequalities are established for submanifolds in a Riemannian manifold of quasi-constant curvature with a semi-symmetric metric connection, which generalize inequalities obtained by Lee et al.
“…Mihai and Özgür [14,15] proved Chen's inequalities for submanifolds in a real space with a semi-symmetric metric connection, a complex space with a semi-symmetric metric connection and a Sasakian space form with a semi-symmetric metric connection. They also studied Chen's inequalities for submanifolds in a real space form endowed with a semi-symmetric non-metric connection [16].…”
Abstract:In this paper, we prove some optimal inequalities involving the intrinsic scalar curvature and the extrinsic Casorati curvature of submanifolds in a generalized complex space form with a semi-symmetric non-metric connection and a generalized Sasakian space form with a semi-symmetric non-metric connection. Moreover, we show that in both cases, the equalities hold if and only if submanifolds are invariantly quasi-umbilical.
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