文摘
In this paper, we study Chen ideal submanifolds \( M^n \) of dimension n in Euclidean spaces \( \mathbb {E}^{n+m} \) (\( n \ge 4 \), \( m \ge 1 \)) satisfying curvature conditions of pseudo-symmetry type of the form: the difference tensor \(R \cdot C - C \cdot R\) is expressed by some Tachibana tensors. Precisely, we consider one of the following three conditions: \( R \cdot C - C \cdot R \) is expressed as a linear combination of Q(g , R) and Q(S , R) , \( R \cdot C - C \cdot R \) is expressed as a linear combination of Q(g , C) and Q(S , C) and \( R \cdot C - C \cdot R \) is expressed as a linear combination of \( Q(g , g \wedge S) \) and \( Q(S , g \wedge S) \). We then characterize Chen ideal submanifolds \( M^n \) of dimension n in Euclidean spaces \( \mathbb {E}^{n+m} \) (\( n \ge 4\), \( m \ge 1 \)) which satisfy one of the following six conditions of pseudo-symmetry type: \( R \cdot C - C \cdot R \) and Q(g , R) are linearly dependent, \( R \cdot C - C \cdot R \) and Q(S , R) are linearly dependent, \( R \cdot C - C \cdot R \) and Q(g , C) are linearly dependent, \( R \cdot C - C \cdot R \) and Q(S , C) are linearly dependent, \( R \cdot C - C \cdot R \) and \( Q(g , g \wedge S) \) are linearly dependent and \( R \cdot C - C \cdot R \) and \( Q(S , g \wedge S) \) are linearly dependent. We also prove that the tensors \(R \cdot R - Q(S,R)\) and Q(g, C) are linearly dependent at every point of \( M^n \) at which its Weyl tensor C is non-zero. Keywords Submanifold Condition of pseudo-symmetry type Generalized Einstein metric condition Chen ideal submanifold Roter space Tachibana tensor