Second bounded cohomology for groups with some hyperbolic properties

Jeudi 31 janvier 2008 14:00-15:00 - Hamenstadt Ursula - Université de Bonn

Résumé : We briefly discuss a general simple method to construct bounded cohomology classes for groups with some hyperbolic properties. We use this to describe closed subgroups of the isometry group of an arbitrary proper hyperbolic geodesic metric space. We also use this to show that the image of lattice in a semi-simple Lie group of higher rank under a homomorphism into the outer automorphism group of a free group is finite.

Lieu : bât. 425 - 121-123

Second bounded cohomology for groups with some hyperbolic properties  Version PDF