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arXiv 1801.00628math.DG
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$σ_2$弯曲变形

Deformation of the $σ_2$-curvature

Almir Silva Santos, Maria Andrade

摘要:

我们的主要目标是处理与$σ_2$ -曲率有关的结果。首先我们找到一个与$σ_2$ -曲率正则相关的对称2-张量,并给出一个Almost Schur型引理.利用这个张量,我们引入了$σ_2$ -奇异空间的概念,并在一定的假设下证明了一个刚性结果。讨论了平坦度量与$σ_2$ -曲率之间的关系.通过对$σ_2$ -曲率的适当条件,我们证明了如果一个度量接近平坦度量,那么它一定是平坦的.本文的结论是:除非三维环面是平坦的,否则它不允许度量具有常数数量曲率和非负$σ_2$ -曲率。

英文摘要:

Our main goal in this work is to deal with results concern to the $σ_2$-curvature. First we find a symmetric 2-tensor canonically associated to the $σ_2$-curvature and we present an Almost Schur Type Lemma. Using this tensor we introduce the notion of $σ_2$-singular space and under a certain hypothesis we prove a rigidity result. Also we deal with the relations between flat metrics and $σ_2$-curvature. With a suitable condition on the $σ_2$-curvature we show that a metric has to be flat if it is close to a flat metric. We conclude this paper by proving that the 3-dimensional torus does not admit a metric with constant scalar curvature and non-negative $σ_2$-curvature unless it is flat.

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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