Modified mean curvature flow of entire locally Lipschitz radial graphs in hyperbolic space

Patrick Allmann, Longzhi Lin and Jingyong Zhu

Mathematische Nachrichten, 2020, vol. 293, issue 5, 861-878

Abstract: The Asymptotic Plateau Problem asks for the existence of smooth complete hypersurfaces of constant mean curvature with prescribed asymptotic boundary at infinity in the hyperbolic space Hn+1. The modified mean curvature flow (MMCF) ∂F∂t=(H−σ)ν,σ∈(−n,n),was firstly introduced by Xiao and the second author a few years back in [15], and it provides a tool using geometric flow to find such hypersurfaces with constant mean curvature in Hn+1. Similar to the usual mean curvature flow, the MMCF is the natural negative L2‐gradient flow of the area‐volume functional I(Σ)=A(Σ)+σV(Σ) associated to a hypersurface Σ. In this paper, we prove that the MMCF starting from an entire locally Lipschitz continuous radial graph exists and stays radially graphic for all time. In general one cannot expect the convergence of the flow as it can be seen from the flow starting from a horosphere (whose asymptotic boundary is degenerate to a point).

Date: 2020
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