Contraction of hypersurfaces with positive sectional curvature in hyperbolic space

Abstract

We study contracting curvature flows of compact hypersurfaces with positive sectional curvature in hyperbolic space ${\mathbb{H}}^{n+1}$. The speed is assumed to be homogeneous of degree one in the principal curvatures and to satisfy certain conditions. This class of flows includes the $k$th mean curvature flow as a special case. We show that if the initial hypersurface has positive sectional curvature, then this property is preserved along the flow, and the evolving hypersurface contracts to a round point in finite time.

25 pages