Abstract
In this paper, we consider the steepest descent H −1-gradient flow of the length functional for immersed plane curves, known as the curve diffusion flow. It is known that under this flow there exist both initially immersed curves that develop at least one singularity in finite time and initially embedded curves that self-intersect in finite time. We prove that under the flow closed curves with initial data close to a round circle in the sense of normalised L 2 oscillation of curvature exist for all time and converge exponentially fast to a round circle. This implies that for a sufficiently large ‘waiting time’, the evolving curves are strictly convex. We provide an optimal estimate for this waiting time, which gives a quantified feeling for the magnitude to which the maximum principle fails. We are also able to control the maximum of the multiplicity of the curve along the evolution. A corollary of this estimate is that initially embedded curves satisfying the hypotheses of the global existence theorem remain embedded. Finally, as an application we obtain a rigidity statement for closed planar curves with winding number one.
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Financial support from the Alexander-von-Humboldt Stiftung is gratefully acknowledged.
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Wheeler, G. On the curve diffusion flow of closed plane curves. Annali di Matematica 192, 931–950 (2013). https://doi.org/10.1007/s10231-012-0253-2
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DOI: https://doi.org/10.1007/s10231-012-0253-2
Keywords
- Geometric evolution equations
- Higher order quasilinear partial differential equations
- Differential geometry of plane curves
- Curve diffusion flow
- Surface diffusion flow