Precompactness of solutions to the Ricci flow in the absence of injectivity radius estimates

Abstract

Consider a sequence of pointed n-dimensional complete Riemannian manifolds {(M_i,g_i(t), O_i)} such that t in [0,T] are solutions to the Ricci flow and g_i(t) have uniformly bounded curvatures and derivatives of curvatures. Richard Hamilton showed that if the initial injectivity radii are uniformly bounded below then there is a subsequence which converges to an n-dimensional solution to the Ricci flow. We prove a generalization of this theorem where the initial metrics may collapse. Without injectivity radius bounds we must allow for convergence in the Gromov-Hausdorff sense to a space which is not a manifold but only a metric space. We then look at the local geometry of the limit to understand how it relates to the Ricci flow.

arXiv commentPublished by Geometry and Topology at http://www.maths.warwick.ac.uk/gt/GTVol7/paper14.abs.html

References in corpus (2)

• Ricci flow with surgery on three-manifolds
• Hamilton's injectivity radius estimate for sequences with almost nonnegative curvature operators

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