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arXiv 2406.04564math.DG
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在奇异集外光滑且具有非负标量曲率的$L^\infty$黎曼度量的光滑化

Smoothing $L^\infty$ Riemannian metrics with nonnegative scalar curvature outside of a singular set

Paula Burkhardt-Guim

AI总结:

该研究针对满足奇异集外光滑非负标量曲率、$L^\infty$接近欧氏度量的$L^\infty$黎曼度量,证明可用Ricci-DeTurck流时间切片逼近,还给出了流保持非负标量曲率的条件。

摘要:

我们证明,对于$\mathbb{R}^n$上任意满足以下条件的$L^\infty$黎曼度量$g$:在有限$(n-α)$维闵可夫斯基容度的奇异集之外光滑且具有非负标量曲率(其中$α>2$),若$g$在$L^\infty$意义下足够接近欧几里得度量,则可由具有非负标量曲率的光滑黎曼度量逼近。该逼近由Ricci-DeTurck流的时间切片给出,这些切片在奇异集之外局部$C^\infty$收敛到$g$。我们还确定了如下条件:当初始$L^\infty$度量与欧氏空间一致双李普希茨等价,且在有限点集之外光滑并具有非负标量曲率时,从该度量出发的光滑Ricci-DeTurck流在正时间下必须保持非负标量曲率。

英文摘要:

We show that any $L^\infty$ Riemannian metric $g$ on $\mathbb{R}^n$ that is smooth with nonnegative scalar curvature away from a singular set of finite $(n-α)$-dimensional Minkowski content, for some $α>2$, admits an approximation by smooth Riemannian metrics with nonnegative scalar curvature, provided that $g$ is sufficiently close in $L^\infty$ to the Euclidean metric. The approximation is given by time slices of the Ricci-DeTurck flow, which converge locally in $C^\infty$ to $g$ away from the singular set. We also identify conditions under which a smooth Ricci-DeTurck flow starting from a $L^\infty$ metric that is uniformly bilipschitz to Euclidean space and smooth with nonnegative scalar curvature away from a finite set of points must have nonnegative scalar curvature for positive times.

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