Paper · Sep 4, 2024

Monotonicity of the modulus under curve shortening flow

Arjun Sobnack, Peter M. Topping

math.DGWider flowsarXiv:2409.03098v2
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Abstract

Given two disjoint nested embedded closed curves in the plane, both evolving under curve shortening flow, we show that the modulus of the enclosed annulus is monotonically increasing in time. An analogous result holds within any ambient surface satisfying a lower curvature bound.

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Connected papers

The 8 papers on this site closest to this one, judged by the topics they share, the words and phrases in their titles and abstracts, and their authors. They are not its citations, but a map of the work around it. Papers here go back to 2021, plus the canon.

Connected papers This paper in the centre and the 8 papers closest to it around it, in date order clockwise from the top. The closer a paper sits to the centre, the stronger the connection. This paper Stabilization technique applied to curve shortening flow in ℝ³ (Hayk Mikayelyan, 2022)7Mikayelyan 2022 Non-uniqueness of curve shortening flow (Luke Thomas Peachey, 2022)4Peachey 2022 Delayed parabolic regularity for curve shortening flow (Arjun Sobnack and Peter M. Topping, 2024)1Sobnack 2024 Curve shortening flows on surfaces that are not convex at infinity (Naotoshi Fujihara, 2024)8Fujihara 2024 Curve shortening flow with an ambient force field (Sam Cuthbertson, Glen Wheeler and Valentina-Mira Wheeler, 2024)5Cuthbertson 2024 A delayed interior area-to-height estimate for the Curve Shortening Flow (Arjun Sobnack, 2025)3Sobnack 2025 The Harnack inequality without convexity for curve shortening flow (Arjun Sobnack and Peter M. Topping, 2026)2Sobnack 2026 The inverse curve shortening flow on the hyperbolic plane (Ivan Krznarić and Rafael López, 2026)6Krznarić 2026
Closer to the centre: more closely connected. Clockwise from the top: oldest to newest. Ricci flowWider flowsalso connected to each other
  1. Delayed parabolic regularity for curve shortening flow

    Arjun Sobnack and Peter M. ToppingWider flows PDF

    Topics Curve shortening · Same authors Arjun Sobnack, Peter M. Topping

  2. The Harnack inequality without convexity for curve shortening flow

    Arjun Sobnack and Peter M. ToppingWider flows PDF

    Topics Curve shortening · Same authors Arjun Sobnack, Peter M. Topping

  3. A delayed interior area-to-height estimate for the Curve Shortening Flow

    Arjun SobnackWider flows PDF

    Topics Curve shortening · Same author Arjun Sobnack

  4. Non-uniqueness of curve shortening flow

    Luke Thomas PeacheyWider flows PDF

    Topics Curve shortening

  5. Curve shortening flow with an ambient force field

    Sam Cuthbertson, Glen Wheeler and Valentina-Mira WheelerWider flows PDF

    Topics Curve shortening · Shared terms “curvature bounds”

  6. Curve shortening flows on surfaces that are not convex at infinity

    Naotoshi FujiharaWider flows PDF

    Topics Curve shortening · Shared terms “embedded closed”, “closed curves”, “increasing”

Read around it

Background reading

The guides for the topics of this paper: what each idea is, why it matters, and the papers to read first.

In the guidebook

  1. 6A.10
    Curve Shortening and the First Geometric FlowsBook 6A · The Heat Equation and Its Relatives

    Shrinking circles, grim reapers, neckpinches and Huisken’s monotonicity, seen in the plane.

  2. 12C.4
    Loops, Disks and Curve ShrinkingBook 12C · Extinction and the Proof

    Perelman III §§2–3 and Morgan–Tian §§18.3–18.7: π₃ as spheres of loops, minimal disks and the −2π estimate, curve shrinking, ramps in M × S¹ and the estimates that make the argument rigorous.