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Bounded cohomology of lattices in higher rank Lie groups

Marc Burger, Nicolas Monod (1999)

Journal of the European Mathematical Society

We prove that the natural map H b 2 ( Γ ) H 2 ( Γ ) from bounded to usual cohomology is injective if Γ is an irreducible cocompact lattice in a higher rank Lie group. This result holds also for nontrivial unitary coefficients, and implies finiteness results for Γ : the stable commutator length vanishes and any C 1 –action on the circle is almost trivial. We introduce the continuous bounded cohomology of a locally compact group and prove our statements by relating H * b ( Γ ) to the continuous bounded cohomology of the ambient group...

Bouts d'un groupe opérant sur la droite, I : théorie algébrique

Gaël-Nicolas Meigniez (1990)

Annales de l'institut Fourier

On étudie les morphismes d’un groupe infini discret Π dans un groupe de Lie G contenu dans le groupe des difféomorphismes de la droite réelle. À un tel morphisme H , on associe deux ensembles de “bouts” de Π “dans la direction” H . On calcule le nombre de bouts dans plusieurs situations. Dans le cas particulier où Π est de type fini et où G est le groupe des translations, Π n’a qu’un bout dans la direction H si, et seulement si, ils vérifient la propriété de Bieri-Neumann-Strebel.

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