Positive Scalar Curvature from a Concordance Viewpoint

Académique ou spécialiste Séminaire
31.05.2022 13:15

Scalar curvature is a local invariant of a Riemannian manifold. It measures asymptotically the volume growth of geodesic balls. Understanding the topological space of all positive scalar curvature metrics on a closed manifold has been an active field of study during the last 30 years. So far, these spaces have been considered from an isotopy viewpoint.
I will describe a new approach to study this space bases on the notion of concordance. To this end, I construct with the help of cubical set theory a comparison space that only encodes concordance information and in which the space of psc metrics canonically embeds. After the presentation of some of its properties I will show that the indexdifference, the most important invariant in this field, factors over the comparison space and draw conclusions.

Quand? 31.05.2022 13:15
Où? PER 07 1.311
Chemin du Musée 6
1700 Fribourg
Intervenants Thorsten Hertl (Uni. Göttingen)
Contact Oberseminar Topologie
Anand Dessai
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