Fluxos geométricos por hipersuperfícies paralelas

Abstract

This thesis aims to study the fl ow through parallel hypersurfaces in Riemannian products and in the sphere. Initially, we will show that the isoparametric hypersurfaces of Sn × S1 e Hn × S1 that have the constant angle are those that have constant principal curvatures, we will also show that a hypersurface of Sn × R , Sn × S1 , Hn × R1 e Hn × S1 is an initial condition for a solution of the mean curvature fl ow by parallel hypersurfaces if, and only if, the hypersurface is isoparametric. In addition, we will show that a strictly convex hypersurface embedded in the sphere is an initial condition for a solution of the inverse mean parallel fl ow if, and only if, the hypersurface is umbilical.