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arXiv 2009.03243math.DGmath.APmath.MG
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里奇流非崩溃极限的结构理论

Structure theory of non-collapsed limits of Ricci flows

Richard H Bamler

摘要:

本文刻画了里奇流的非崩溃极限。我们表明,这样的限制是光滑的,从一组余维$\geq 4$在抛物意义上,切流在每一点上的梯度收缩孤子,可能有一个奇异的余维集$\geq 4$。我们还得到了奇异集的一个分层结果,其最优维数界依赖于切流的对称性。我们的方法也意味着相应的定量分层结果和预期的$L^p$曲率界限。作为我们理论的应用,我们得到了里奇流在第一奇异时刻奇异性形成的描述和不朽流长时间行为的厚-薄分解.这些结果推广了Perelman在3维到更高维的结果。我们还得到了一个后向伪局部性定理,并讨论了它的一些应用。

英文摘要:

In this paper we characterize non-collapsed limits of Ricci flows. We show that such limits are smooth away from a set of codimension $\geq 4$ in the parabolic sense and that the tangent flows at every point are given by gradient shrinking solitons, possibly with a singular set of codimension $\geq 4$. We furthermore obtain a stratification result of the singular set with optimal dimensional bounds, which depend on the symmetries of the tangent flows. Our methods also imply the corresponding quantitative stratification result and the expected $L^p$-curvature bounds. As an application of our theory, we obtain a description of the singularity formation of a Ricci flow at its first singular time and a thick-thin decomposition characterizing the long-time behavior of immortal flows. These results generalize Perelman's results in dimension 3 to higher dimensions. We also obtain a Backwards Pseudolocality Theorem and discuss several other applications.

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