The Diffeomorphism Type of Manifolds with Almost Maximal Volume

Details The Diffeomorphism Type of Manifolds with Almost Maximal Volume The Diffeomorphism Type of Manifolds with Almost Maximal Volume

2012-01-02

arxiv.org/abs/1201.0415v1

Mathematics

Differential Geometry

25 pages, 3 figures

Scientific paper

The smallest $r$ so that a metric $r$-ball covers a metric space $M$ is called the radius of $M$. The volume of a metric $r$-ball in the space form of constant curvature $k$ is an upper bound for the volume of any Riemannian manifold with sectional curvature $\geq k$ and radius $\leq r$. We show that when such a manifold has volume almost equal to this upper bound, it is diffeomorphic to a sphere or a real projective space.

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