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Geometria Diferencial

 Título On the Moduli Spaces of Metrics with Nonnegative Sectional Curvature Expositor Jackson Goodman UPENN Data Terça-feira, 17 de julho de 2018, 15:30 Local Sala 236 Resumo

The Kreck-Stolz s invariant is used to distinguish connected components of the moduli space of positive scalar curvature metrics. We use a formula of Kreck and Stolz to calculate the s invariant for metrics on Sn bundles with nonnegative sectional curvature. We then apply it to show that the moduli spaces of metrics with nonnegative sectional curvature on certain 7-manifolds have infinitely many path components. These include the first non-homogeneous examples of this type and certain positively curved Eschenburg and Aloff-Wallach spaces.