Nous établissons des obstructions à l’existence d’actions de groupes par homéomorphismes sur des dendrites. Par exemple, les réseaux de groupes de Lie simples en rang supérieur à 2 fixent toujours un point ou une paire de points. Le même résultat est obtenu pour des réseaux irréductibles dans des produits de groupes connexes. D’autres résultats incluent une alternative de Tits et une description de la dynamique des actions de groupes.
Nous discutons brièvement dans quelle mesure nos résultats peuvent s’étendre au cas plus général des courbes topologiques.
We establish obstructions for groups to act by homeomorphisms on dendrites. For instance, lattices in higher rank simple Lie groups will always fix a point or a pair. The same holds for irreducible lattices in products of connected groups. Further results include a Tits alternative and a description of the topological dynamics.
We briefly discuss to what extent our results hold for more general topological curves.
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Keywords: dendrites, groups, rigidity, bounded cohomology, lattices, Tits alternative, dynamics, curves
Mot clés : dendrites, groupes, rigidité, cohomology bornée, réseaux, alternative de Tits, dynamique, courbes
Duchesne, Bruno 1 ; Monod, Nicolas 2
@article{AIF_2018__68_5_2277_0, author = {Duchesne, Bruno and Monod, Nicolas}, title = {Group actions on dendrites and curves}, journal = {Annales de l'Institut Fourier}, pages = {2277--2309}, publisher = {Association des Annales de l{\textquoteright}institut Fourier}, volume = {68}, number = {5}, year = {2018}, doi = {10.5802/aif.3209}, language = {en}, url = {https://aif.centre-mersenne.org/articles/10.5802/aif.3209/} }
TY - JOUR AU - Duchesne, Bruno AU - Monod, Nicolas TI - Group actions on dendrites and curves JO - Annales de l'Institut Fourier PY - 2018 SP - 2277 EP - 2309 VL - 68 IS - 5 PB - Association des Annales de l’institut Fourier UR - https://aif.centre-mersenne.org/articles/10.5802/aif.3209/ DO - 10.5802/aif.3209 LA - en ID - AIF_2018__68_5_2277_0 ER -
%0 Journal Article %A Duchesne, Bruno %A Monod, Nicolas %T Group actions on dendrites and curves %J Annales de l'Institut Fourier %D 2018 %P 2277-2309 %V 68 %N 5 %I Association des Annales de l’institut Fourier %U https://aif.centre-mersenne.org/articles/10.5802/aif.3209/ %R 10.5802/aif.3209 %G en %F AIF_2018__68_5_2277_0
Duchesne, Bruno; Monod, Nicolas. Group actions on dendrites and curves. Annales de l'Institut Fourier, Tome 68 (2018) no. 5, pp. 2277-2309. doi : 10.5802/aif.3209. https://aif.centre-mersenne.org/articles/10.5802/aif.3209/
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