On Ricci tensor of focal submanifolds of isoparametric hypersurfaces
首发时间:2014-06-17
Abstract: $mathcal{A}$-manifolds and $mathcal{B}$-manifolds, introduced by A.Gray, are two significant classes of Einstein-like Riemannian manifolds. A Riemannian manifold is Ricci parallel if and only if it is simultaneously an $mathcal{A}$-manifold and a $mathcal{B}$-manifold. The present paper proves that both focal submanifolds of each isoparametric hypersurface in unit spheres with $g=4$ distinct principal curvatures are $mathcal{A}$-manifolds. As for the focal submanifolds with $g=6$, $m=1$ or $2$, only one is an $mathcal{A}$-manifold, and neither is a $mathcal{B}$-manifold.
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等参超曲面的焦流形的Ricci张量
摘要:A.Gray 引入的$A$-流形和$B$-流形,是两类非常重要的类爱因斯坦黎曼流形。一个黎曼流形是Ricci平行的,当且仅当它同时是$A$-流形和$B$-流形。本文证明了单位球面中有$g=4$的不同主曲率的等参超曲面的两个焦流形都是$A$-流形。而对应于$g=6$,$m=1$ 或 $2$的焦流形,只有一个是$A$-流形,两个都不是$B$-流形。
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No.4599805981950140****
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