Collapsing sequences of solutions to the Ricci flow on 3-manifolds with almost nonnegative curvature

Details Collapsing sequences of solutions to the Ricci flow on 3-manifolds with almost nonnegative curvature Collapsing sequences of solutions to the Ricci flow on 3-manifolds with almost nonnegative curvature

2003-05-15

arxiv.org/abs/math/0305228v1

Mathematics

Differential Geometry

28 pages

Scientific paper

We study sequences of 3-dimensional solutions to the Ricci flow with almost nonnegative sectional curvatures and diameters tending to infinity. Such sequences may arise from the limits of dilations about singularities of Type IIb. In particular, we study the case when the sequence collapses, which may occur when dilating about infinite time singularities. In this case we classify the possible Gromov-Hausdorff limits and construct 2-dimensional virtual limits. The virtual limits are constructed using Fukaya theory of the limits of local covers. We then show that the virtual limit arising from appropriate dilations of a Type IIb singularity is always Hamilton's cigar soliton solution.

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