Paper · Jan 25, 2024
The Avoidance Principle for Noncompact Hypersurfaces Moving by Mean Curvature Flow
As on arXiv
Abstract
Consider a pair of smooth, possibly noncompact, properly immersed hypersurfaces moving by mean curvature flow, or, more generally, a pair of weak set flows. We prove that if the ambient space is Euclidean space and if the distance between the two surfaces is initially nonzero, then the surfaces remain disjoint at all subsequent times. We prove the same result when the ambient space is a complete Riemannian manifold of nonzero injectivity radius, provided the curvature tensor (of the ambient space) and all its derivatives are bounded.
Comments: 20 pages. The newest version (March 24, 2024) corrects a few typos. The previous version (February 1, 2024) had some additions to the abstract and to the introduction
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- 6A.10Curve Shortening and the First Geometric Flows
Shrinking circles, grim reapers, neckpinches and Huisken’s monotonicity, seen in the plane.