Total curvatures of model surfaces control topology of complete open manifolds with radial curvature bounded below. I

Abstract

We investigate the finiteness structure of a complete non-compact $n$-dimensional Riemannian manifold $M$ whose radial curvature at a base point of $M$ is bounded from below by that of a non-compact von Mangoldt surface of revolution with its total curvature greater than $\pi$. We show, as our main theorem, that all Busemann functions on $M$ are exhaustions, and that there exists a compact subset of $M$ such that the compact set contains all critical points for any Busemann function on $M$. As corollaries by the main theorem, $M$ has finite topological type, and the isometry group of $M$ is compact.

arXiv commentThis version 2 is a version to appear in Math. Ann. 16 pages, No figures

References in corpus (1)

• Toponogov comparison theorem for open triangles

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