Long-time Ricci flow existence and topological rigidity from manifolds with pinched scale-invariant integral curvature

We prove long-time existence of the Ricci flow starting from complete manifolds with bounded curvature and scale-invariant integral curvature sufficiently pinched with respect to the inverse of its Sobolev constant. Moreover, if the curvature is sub-critical Lᵖ integrable, this flow converges locally smoothly to a limiting metric g () on M with (M, g () ) isometric to the standard flat Rⁿ, which implies topological rigidity of M. This generalizes work of Chen, who proved analogous results for asymptotically flat manifolds. We also prove a long-time Ricci flow existence (and likewise topological rigidity) result for unbounded curvature initial data, assuming the initial data is a locally smooth limit of bounded curvature manifolds as described above.