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arXiv 1109.0243math.DG
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具有非负Ricci张量的共形梯度孤子的整体结构

On the global structure of conformal gradient solitons with nonnegative Ricci tensor

Giovanni Catino, Carlo Mantegazza, Lorenzo Mazzieri

摘要:

本文证明了任何具有非负Ricci张量的完备共形梯度孤子要么等距于直积$\mathbb{R}\times N^{n-1}$,要么整体共形等价于欧几里得空间$\mathbb{R}^{n}$或球面$\mathbb{S}^{n}$ .特别地,我们证明了任何完整的,非紧的,梯度Yamabe型孤子与正Ricci张量是旋转对称的,只要势函数是非常数。

英文摘要:

In this paper we prove that any complete conformal gradient soliton with nonnegative Ricci tensor is either isometric to a direct product $\mathbb{R}\times N^{n-1}$, or globally conformally equivalent to the Euclidean space $\mathbb{R}^{n}$ or to the round sphere $\mathbb{S}^{n}$. In particular, we show that any complete, noncompact, gradient Yamabe-type soliton with positive Ricci tensor is rotationally symmetric, whenever the potential function is nonconstant.

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