积分体积亏损界下非坍塌 Ricci 极限空间的余维三正则性
Codimension-three regularity of noncollapsed Ricci limit spaces under an integral volume-deficit bound
- Northeast Normal University(东北师范大学)
机构由 AI 辅助整理,请以论文原文为准。
AI总结:
本文在积分体积亏损界条件下,证明非坍塌 Ricci 极限空间的度量奇异集维数至多 $n-3$,证实余维三正则性猜想特例。
AI中文摘要:
设 $(X,d,p)$ 是完备 $n$ 维黎曼流形($n\ge4$)在一致下 Ricci 曲率界下非坍塌的尖 Gromov--Hausdorff 极限。我们假设在每个有界球上,小球的体积亏损相对于双曲比较体积的 $3/2$ 次幂的积分当 $r\rightarrow0$ 时为 $O(r^3)$。我们证明度量奇异集的 Hausdorff 维数至多为 $n-3$,且具有 $\sigma$-有限的 $(n-3)$ 维 Hausdorff 测度,从而证实了余维三正则性猜想的一个特例 \cite[猜想 2.4]{Naber2020}。
英文摘要:
Let $(X,d,p)$ be a noncollapsed pointed Gromov--Hausdorff limit of complete $n$-dimensional Riemannian manifolds with a uniform lower Ricci curvature bound, where $n\ge4$. We assume that, on each bounded ball, the integral of the $3/2$ power of the small-ball volume deficit relative to the hyperbolic comparison volume is $O(r^3)$ as $r\rightarrow0$. We prove that the metric singular set has Hausdorff dimension at most $n-3$ and sigma-finite $(n-3)$-dimensional Hausdorff measure, thus confirming a particular case of codimension-three regularity conjecture \cite[Conjecture 2.4]{Naber2020}.