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arxiv: 0711.1668 · v1 · submitted 2007-11-11 · 🧮 math.DG · math.CV

On Optimal 4-Dimensional Metrics

classification 🧮 math.DG math.CV
keywords metricsconnectedadmitadmitsanti-self-dualcompactcompletelycomplex
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We completely determine, up to homeomorphism, which simply connected compact oriented 4-manifolds admit scalar-flat, anti-self-dual Riemannian metrics. The key new ingredient is a proof that the connected sum of five reverse-oriented complex projective planes admits such metrics.

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