Complete surfaces with negative extrinsic curvature

Details Complete surfaces with negative extrinsic curvature Complete surfaces with negative extrinsic curvature

1999-12-13

arxiv.org/abs/math/9912101v1

Mathematics

Differential Geometry

38 pages, 6 figures

Scientific paper

N. V. Efimov \cite{Ef1} proved that there is no complete, smooth surface in $\R^3$ with uniformly negative curvature. We extend this to isometric immersions in a 3-manifold with pinched curvature: if $M^3$ has sectional curvature between two constants $K_2$ and $K_3$, then there exists $K_1 < \min(K_2, 0)$ such that $M$ contains no smooth, complete immersed surface with curvature below $K_1$. Optimal values of $K_1$ are determined. This results rests on a phenomenon of propagations for degenerations of solutions of hyperbolic Monge-Amp{\`e}re equations.

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