Comparison and Rigidity Theorems in Semi-Riemannian Geometry

Details Comparison and Rigidity Theorems in Semi-Riemannian Geometry Comparison and Rigidity Theorems in Semi-Riemannian Geometry

1997-07-25

arxiv.org/abs/dg-ga/9707020v1

Mathematics

Differential Geometry

46 pages, amsart, to appear in Comm. Anal. Geom

Scientific paper

The comparison theory for the Riccati equation satisfied by the shape operator of parallel hypersurfaces is generalized to semi-Riemannian manifolds of arbitrary index, using one-sided bounds on the Riemann tensor which in the Riemannian case correspond to one-sided bounds on the sectional curvatures. Starting from 2-dimensional rigidity results and using an inductive technique, a new class of gap-type rigidity theorems is proved for semi-Riemannian manifolds of arbitrary index, generalizing those first given by Gromov and Greene-Wu. As applications we prove rigidity results for semi-Riemannian manifolds with simply connected ends of constant curvature.

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