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

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

2002-11-12

arxiv.org/abs/math/0211191v3

Geom. Topol. 7(2003) 487-510

Mathematics

Differential Geometry

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

Scientific paper

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.

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