Nonlinear evolution by mean curvature and isoperimetric inequalities

Details Nonlinear evolution by mean curvature and isoperimetric inequalities Nonlinear evolution by mean curvature and isoperimetric inequalities

2006-06-27

arxiv.org/abs/math/0606675v1

Mathematics

Differential Geometry

42 pages

Scientific paper

Evolving smooth, compact hypersurfaces in R^{n+1} with normal speed equal to a positive power k of the mean curvature improves a certain 'isoperimetric difference' for k >= n-1. As singularities may develop before the volume goes to zero, we develop a weak level-set formulation for such flows and show that the above monotonicity is still valid. This proves the isoperimetric inequality for n <= 7. Extending this to complete, simply connected 3-dimensional manifolds with nonpositive sectional curvature, we give a new proof for the Euclidean isoperimetric inequality on such manifolds.

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