#### Vol. 13, No. 3, 2020

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The gradient flow of the Möbius energy: $\varepsilon$-regularity and consequences

### Simon Blatt

Vol. 13 (2020), No. 3, 901–941
##### Abstract

We study the gradient flow of the Möbius energy introduced by O’Hara (Topology 30:2 (1991), 241–247). We will show a fundamental $𝜀$-regularity result that allows us to bound the infinity norm of all derivatives for some time if the energy is small on a certain scale. This result enables us to characterize the formation of a singularity in terms of concentrations of energy and allows us to construct a blow-up profile at a possible singularity. This solves one of the open problems listed by Zheng-Xu He (Comm. Pure Appl. Math. 53:4 (2000), 399–431).

Ruling out blow-ups for planar curves, we will prove that the flow transforms every planar curve into a round circle.

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