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Ancient gradient flows of elliptic functionals and Morse index

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arxiv 1902.07697 v3 pith:CBGS6MEV submitted 2019-02-20 math.DG math.AP

classification math.DGmath.AP
keywords ancientflowsclassifycurvatureflowmeanshrinkingsteady
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We study closed ancient solutions to gradient flows of elliptic functionals in Riemannian manifolds, including mean curvature flow and harmonic map heat flow. Our work has various consequences. In all dimensions and codimensions, we classify ancient mean curvature flows in S^n with low area: they are steady or shrinking equatorial spheres. In the mean curvature flow case in S^3, we classify ancient flows with more relaxed area bounds: they are steady or shrinking equators or Clifford tori. In the embedded curve shortening case in S^2, we completely classify ancient flows of bounded length: they are steady or shrinking circles.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Codimension Bounds and Rigidity of Ancient Mean Curvature Flows by the Tangent Flow at $-\infty$

    math.DG 2019-09 conditional novelty 7.0 of 10

    Ancient mean curvature flows that converge rapidly to a compact self-shrinker at time minus infinity must have the same codimension as the shrinker, and if the convergence is super-exponential the flow equals the shrinker.

  2. Construction of High Codimension Ancient Mean Curvature Flows

    math.DG 2019-08 conditional novelty 2.0 of 10

    The paper constructs high-codimension ancient curve shortening flows, but the abstract and Remark 1.3 state the construction was earlier discovered in AAAW13.

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