arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1902.06191math.DG
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近似Kaehler流形的双翘积子流形

Bi-warped product submanifolds of nearly Kaehler manifolds

Siraj Uddin, Bang-Yen Chen, Awatif AL-Jedani, Azeb Alghanemi

摘要:

研究了几乎Kaehler流形的双曲积子流形,它是曲积的自然扩张.本文证明了几乎Kaehler流形中形式为$M=M_T\times_{f_1}\! M_\perp\times_{f_2}\! M_θ$的每一个双弯曲积子流形都满足下列尖锐不等式:$$\|h\|^2\geq 2p\|\nabla (\ln f_1)\|^2+4q\left(1+{\small \frac{10}{9}}\cot^2θ\right)\|\nabla(\ln f_2)\|^2,$$其中$p=\dim M_\perp$,$q=\frac{1}{2}\dim M_θ$,和$f_1,\,f_2$是$M_T$上的光滑正函数.我们还研究了这个不等式的等式情形。此外,还给出了该不等式的一些应用.

英文摘要:

We study bi-warped product submanifolds of nearly Kaehler manifolds which are the natural extension of warped products. We prove that every bi-warped product submanifold of the form $M=M_T\times_{f_1}\! M_\perp\times_{f_2}\! M_θ$ in a nearly Kaehler manifold satisfies the following sharp inequality: $$\|h\|^2\geq 2p\|\nabla (\ln f_1)\|^2+4q\left(1+{\small \frac{10}{9}}\cot^2θ\right)\|\nabla(\ln f_2)\|^2,$$ where $p=\dim M_\perp$, $q=\frac{1}{2}\dim M_θ$, and $f_1,\,f_2$ are smooth positive functions on $M_T$. We also investigate the equality case of this inequality. Further, some applications of this inequality are also given.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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