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arXiv · 2007.08671

Existence of Riemannian metrics with positive biorthogonal curvature on simply connected 5-manifolds

Boris Stupovski·Rafael Torres
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Abstract

Using recent work of Bettiol, we show that a first-order conformal deformation of Wilking's metric of almost-positive sectional curvature on $S^2\times S^3$ yields a family of metrics with strictly positive average of sectional curvatures of any pair of 2-planes that are separated by a minimal distance in the 2-Grassmanian. A result of Smale's allows us to conclude that every closed simply connected 5-manifold with torsion-free homology and trivial second Stiefel-Whitney class admits a Riemannian metric with a strictly positive average of sectional curvatures of any pair of orthogonal 2-planes.

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Boris Stupovski, Rafael Torres. 2020-07-16. Existence of Riemannian metrics with positive biorthogonal curvature on simply connected 5-manifolds. https://arxiv.org/abs/2007.08671

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