Uniformly Area Expanding Flows in Spacetimes

Abstract

The central object of study of this thesis is inverse mean curvature vector flow of two-dimensional surfaces in four-dimensional spacetimes. Being a system of forward-backward parabolic PDEs, inverse mean curvature vector flow equation lacks a general existence theory. Our main contribution is proving that there exist infinitely many spacetimes, not necessarily spherically symmetric or static, that admit smooth global solutions to inverse mean curvature vector flow. Prior to our work, such solutions were only known in spherically symmetric and static spacetimes. The technique used in this thesis might be important to prove the Spacetime Penrose Conjecture, which remains open today. Given a spacetime $(N^4,\overline{g})$ and a spacelike hypersurface $M$. For any closed surface $\Sigma$ embedded in $M$ satisfying some natural conditions, one can "steer" the spacetime metric $\overline{g}$ such that the mean curvature vector field of $\Sigma$ becomes tangential to $M$ while keeping the induced metric on $M$. This can be used to construct more examples of smooth solutions to inverse mean curvature vector flow from smooth solutions to inverse mean curvature flow in a spacelike hypersurface.

134 pages, 12 figures. This is my Ph.D. thesis, department of mathematics, Duke University, April 2014

References in corpus (5)

• Generalized inverse mean curvature flows in spacetime
• A volumetric Penrose inequality for conformally flat manifolds
• Time flat surfaces and the monotonicity of the spacetime Hawking mass
• Time flat surfaces and the monotonicity of the spacetime Hawking mass II
• Wave Dark Matter and Dwarf Spheroidal Galaxies