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arXiv 2107.02785math.DGmath.CV
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非共形平面球上的拟共形流

Quasiconformal Flows on non-Conformally Flat Spheres

Sun-Yung Alice Chang, Eden Prywes, Paul Yang

摘要:

我们研究积分曲率条件的黎曼度量$g$ $S^4$上,量化之间的最佳bilipschitz常数$(S^4,g)$和标准度量$S^4$。结果表明,最佳的bilipschitz常数由Weyl张量的$L^2$ -范数和$Q$ -曲率的$L^1$ -范数控制,在这些量足够小的条件下,$g$具有正的Yamabe常数,$Q$ -曲率是平均正的.结果的证明分两步实现。首先,我们在正Yamabe类中构造了两个共形相关度量之间的拟共形映射。其次,我们应用里奇流建立了从这样的共形类到$S^4$上的标准共形类的bilipschitz等价。

英文摘要:

We study integral curvature conditions for a Riemannian metric $g$ on $S^4$ that quantify the best bilipschitz constant between $(S^4,g)$ and the standard metric on $S^4$. Our results show that the best bilipschitz constant is controlled by the $L^2$-norm of the Weyl tensor and the $L^1$-norm of the $Q$-curvature, under the conditions that those quantities are sufficiently small, $g$ has a positive Yamabe constant and the $Q$-curvature is mean-positive. The proof of the result is achieved in two steps. Firstly, we construct a quasiconformal map between two conformally related metrics in a positive Yamabe class. Secondly, we apply the Ricci flow to establish the bilipschitz equivalence from such a conformal class to the standard conformal class on $S^4$.

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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