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arXiv 1707.04846math.DG
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关于四维梯度Ricci孤子的分类

On the classification of four-dimensional gradient Ricci solitons

Fei Yang, Liangdi Zhang

摘要:

本文证明了四维梯度Ricci孤子的一些分类结果。对于具有$div^4Rm^\pm=0$的四维梯度收缩Ricci孤子,我们证明了它是Einstein孤子,或者是$\mathbb{R}^4$,$\mathbb{S}^2\times\mathbb{R}^2$或$\mathbb{S}^3\times\mathbb{R}$的有限商。在$div^4W^\pm=0$的条件下也可以得到相同的结果。给出了具有非负里奇曲率的四维完全非紧梯度展开Ricci孤子和在一定曲率条件下梯度稳定Ricci孤子的分类结果。

英文摘要:

In this paper, we prove some classification results for four-dimensional gradient Ricci solitons. For a four-dimensional gradient shrinking Ricci soliton with $div^4Rm^\pm=0$, we show that it is either Einstein or a finite quotient of $\mathbb{R}^4$, $\mathbb{S}^2\times\mathbb{R}^2$ or $\mathbb{S}^3\times\mathbb{R}$. The same result can be obtained under the condition of $div^4W^\pm=0$. We also present some classification results of four-dimensional complete non-compact gradient expanding Ricci soliton with non-negative Ricci curvature and gradient steady Ricci solitons under certain curvature conditions.

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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