A symmetric 2-tensor canonically associated to Q-curvature and its applications

A symmetric 2-tensor canonically associated to Q-curvature and its applications
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与 Q 曲率典型关联的对称 2-张量及其应用

DOI:
10.2140/pjm.2017.291.425
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发表时间:
2016-02
影响因子:
0.6
通讯作者:
Yuan Wei
Yuan Wei
中科院分区:
数学4区
文献类型:
--
作者:
Lin Yueh-Ju;Yuan Wei

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在这篇文章中,我们定义了一个对称的2-张量规范地与Q-曲率称为J-张量的任何黎曼流形上的维数至少为3。J-张量与Q-曲率的关系与Ricci张量与标量曲率的关系完全相同。因此,它可以解释为Ricci张量的高阶模拟。这个张量也可以用来理解关于四维Q-奇异度量的Chang-Gursky-Yang定理。此外,我们还证明了一个关于Q-曲率的Almost-Schur引理,它给出了闭流形上Q-曲率的一个估计。
In this article, we define a symmetric 2-tensor canonically associated to Q-curvature called J-tensor on any Riemannian manifold with dimension at least three. The relation between J-tensor and Q-curvature is precisely like Ricci tensor and scalar curvature. Thus it can be interpreted as a higher-order analogue of Ricci tensor. This tensor can also be used to understand Chang-Gursky-Yang's theorem on 4-dimensional Q-singular metrics. Moreover, we show an Almost-Schur Lemma holds for Q-curvature, which gives an estimate of Q-curvature on closed manifolds.
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