Alexis Marchand, "Stable commutator length, spectral gaps, and negative curvature in groups"

Quand : 11 juin 2026 à 10:30

Où : IHP, 11 rue Pierre et Marie Curie, Paris 5e

Organisé par : Institut Henri Poincaré

Stable commutator length (scl) is a measure of homological complexity of group elements, with connections to many topics in group theory and geometric topology, including quasimorphisms, bounded cohomology, and circle actions. The first part of the talk will be a general introduction to scl and to some of these topics In the second part, we will focus on spectral gaps and their relation with notio