Removability of point singularities of Willmore surfaces

Abstract

We investigate point singularities of Willmore surfaces, which for example appear as blowups of the Willmore flow near singularities, and prove that closed Willmore surfaces with one unit density point singularity are smooth in codimension one. As applications we get in codimension one that the Willmore flow of spheres with energy less than $8 \pi$ exists for all time and converges to a round sphere and further that the set of Willmore tori with energy less than $8 \pi – \delta$ is compact up to Möbius transformations.

Authors

Ernst Kuwert

Mathematisches Institut
Albert-Ludwigs-Universität
D-79104 Freiburg
Germany

Reiner Schätzle

Mathematisch-Naturwissenschaftliche Fakultät
Rheinische Friedrich-Wilhelms-Universität Bonn
53115 Bonn
Germany