
Finite Diffeomorphism Types of Four Dimensional Ricci Flow with Bounded Scalar Curvature
Wen Shuai JIANG
数学学报(英文) ›› 2021, Vol. 37 ›› Issue (11) : 1751-1767.
Finite Diffeomorphism Types of Four Dimensional Ricci Flow with Bounded Scalar Curvature
Finite Diffeomorphism Types of Four Dimensional Ricci Flow with Bounded Scalar Curvature
In this paper, we consider Ricci flow on four dimensional closed manifold with bounded scalar curvature, noncollasping volume and bounded diameter. Under such conditions, we can show that the manifold has finitely many diffeomorphism types, which generalizes Cheeger-Naber's result to bounded scalar curvature along Ricci flow. In particular, this implies the manifold has uniform L2 Riemann curvature bound. As an application, we point out that four dimensional Ricci flow would not have uniform scalar curvature upper bound if the initial metric only satisfying lower Ricci curvature bound, lower volume bound and upper diameter bound.
In this paper, we consider Ricci flow on four dimensional closed manifold with bounded scalar curvature, noncollasping volume and bounded diameter. Under such conditions, we can show that the manifold has finitely many diffeomorphism types, which generalizes Cheeger-Naber's result to bounded scalar curvature along Ricci flow. In particular, this implies the manifold has uniform L2 Riemann curvature bound. As an application, we point out that four dimensional Ricci flow would not have uniform scalar curvature upper bound if the initial metric only satisfying lower Ricci curvature bound, lower volume bound and upper diameter bound.
Ricci flow / scalar curvature {{custom_keyword}} /
Supported by NSFC (Grant No. 11701507) and the Fundamental Research Funds for the Central Universities 2019QNA3001 and DECRA 190101471
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