A Converging Lagrangian Curvature Flow in the Space of Oriented Lines
arXiv:1310.4402 · doi:10.2206/kyushujm.70.343
Abstract
Under mean radius of curvature flow, a closed convex surface in Euclidean space is known to expand exponentially to infinity. In the 3-dimensional case we prove that the oriented normals to the flowing surface converge to the oriented normals of a round sphere whose centre is determined by the initial surface. To prove this we show that the oriented normal lines, considered as a surface in the space of all oriented lines, evolve by a parabolic flow which preserves the Lagrangian condition. Moreover, this flow converges to a holomorphic Lagrangian section, which form the set of oriented lines through a point. The coordinates of this centre point are projections of the support function into the first non-zero eigenspace of the spherical Laplacian and are given by explicit integrals of initial surface data.
8 pages AMS-TEX, v2 includes fixed typos, improved exposition. A video of a talk explaining the methods and results of this paper can be found at the following link: https://youtu.be/Sx1T6legtgQ