Contracting automorphisms and L^p-cohomology in degree one

Details Contracting automorphisms and L^p-cohomology in degree one Contracting automorphisms and L^p-cohomology in degree one

2009-08-18

arxiv.org/abs/0908.2603v1

Mathematics

Group Theory

27 pages, no figure

Scientific paper

We characterize those Lie groups, and algebraic groups over a local field of characteristic zero, whose first reduced L^p-cohomology is zero for all p>1, extending a result of Pansu. As an application, we obtain a description of Gromov-hyperbolic groups among those groups. In particular we prove that any non-elementary Gromov-hyperbolic algebraic group over a non-Archimedean local field of zero characteristic is quasi-isometric to a 3-regular tree. We also extend the study to semidirect products of a general locally compact group by a cyclic group acting by contracting automorphisms.

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