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arXiv 2305.18567math.DG
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关于三维情形下 Llarull 定理的稳定性

On the Stability of Llarull's Theorem in Dimension Three

Brian Allen, Edward Bryden, Demetre Kazaras

AI总结:

本文在三维情形下解决了 Gromov 提出的 Spherical Stability Problem,证明了在距离、等周常数和标量曲率满足特定条件下,Riemannian 3 维球面在保体积的 Sormani-Wenger Intrinsic Flat 意义下趋近于标准球面。

摘要:

Llarull 定理指出,$n$ 维球面上任何标量曲率大于等于 $n(n-1)$ 且距离函数下界为单位球面距离函数的 Riemannian 度量,必定与单位球面等距。Gromov 随后提出了 Spherical Stability Problem,旨在探究该结论的灵活性。我们在 $3$ 维情形下解决了这一问题。非正式地说,主要结果表明,对于一列 Riemannian $3$ 维球面,若其距离函数下界为单位球面的距离函数,Cheeger 等周常数一致有界,且标量曲率趋于 $6$,则其必在保体积的 Sormani-Wenger Intrinsic Flat 意义下趋近于标准 $3$ 维球面。该论证基于 Hirsch-Kazaras-Khuri-Zhang 利用时空调和函数对 Llarull 定理的证明。

英文摘要:

Llarull's Theorem states that any Riemannian metric on the $n$-sphere which has scalar curv{\-}ature greater than or equal to $n(n-1)$, and whose distance function is bounded below by the unit sphere's, is isometric to the unit sphere. Gromov later posed the {\emph{Spherical Stability Problem}}, which probes the flexibility of this fact. We give a resolution to this problem in dimension $3$. Informally, the main result asserts that a sequence of Riemannian $3$-spheres whose distance functions are bounded below by the unit sphere's with uniformly bounded Cheeger isoperimetric constant and scalar curvatures tending to $6$ must approach the round $3$-sphere in the volume preserving Sormani-Wenger Intrinsic Flat sense. The argument is based on a proof of Llarull's Theorem due to Hirsch-Kazaras-Khuri-Zhang using spacetime harmonic functions.

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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