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Sharp distance comparison for curve shortening flow on the round sphere

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arxiv 2310.02649 v1 pith:APZ36DP2 submitted 2023-10-04 math.DG

classification math.DG
keywords roundsharpcurveflowplanarshorteningspheretime
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We prove that curve shortening flow on the round sphere displays sharp chord-arc improvement, precisely as in the planar setting (Andrews and Bryan, Comm. Anal. Geom., 2011). As in the planar case, the sharp estimate implies control on the curvature, resulting in a direct and efficient proof that simple spherical curves either contract to round points (in finite time) or converge to great circles (in infinite time).

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