Ricci flow and nonnegativity of sectional curvature

Lei Ni

Type: Article

Publication Date: 2004-01-01

Citations: 36

DOI: https://doi.org/10.4310/mrl.2004.v11.n6.a12

Abstract

In this paper, we extend the general maximum principle in [NT3] to the time dependent Lichnerowicz heat equation on symmetric tensors coupled with the Ricci flow on complete Riemannian manifolds.As an application we exhibit complete Riemannian manifolds with bounded nonnegative sectional curvature of dimension greater than three such that the Ricci flow does not preserve the nonnegativity of the sectional curvature, even though the nonnegativity of the sectional curvature was proved to be preserved by Hamilton in dimension three.This fact is proved through a general splitting theorem on the complete family of metrics with nonnegative sectional curvature, deformed by the Ricci flow.

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Mathematical Research Letters - View - PDF
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+ PDF Chat	Some examples of manifolds of nonnegative curvature	1973	Jeff Cheeger
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+	Comparison Theorems in Riemannian Geometry	2008	Jeff Cheeger David G. Ebin
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