Abstract
In this paper we study a boundary value problem in manifolds with weakly umbilic boundary (the Second Fundamental form of the boundary is a constant multiple of the metric). We show that if we start with a metric of positive curvature and convex boundary (positive Second Fundamental form), the Ricci flow uniformizes the curvature. In the case of a metric with rotational symmetry, we indicate how to weaken the hypothesis to positive Ricci curvature and positive Second Fundamental form.
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Cortissoz, J.C. Three-manifolds of positive curvature and convex weakly umbilic boundary. Geom Dedicata 138, 83–98 (2009). https://doi.org/10.1007/s10711-008-9300-y
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DOI: https://doi.org/10.1007/s10711-008-9300-y