Topological properties of positively curved manifolds with symmetry
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Manifolds admitting positive sectional curvature are conjectured to have rigid homotopical structure and, in particular, comparatively small Euler charateristics. In this article, we obtain upper bounds for the Euler characteristic of a positively curved Riemannian manifold that admits a large isometric torus action. We apply our results to prove obstructions to symmetric spaces, products of manifolds, and connected sums admitting positively curved metrics with symmetry.
Mathematics Subject ClassificationPrimary 53C20 Secondary 57N65
Keywords and phrasesPositive curvature Symmetry Euler characteristic Betti numbers Hopf conjecture Elliptic genus Symmetric spaces
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