[Géométrie asymptotique des variétés de volume fini à courbure négative]
Nous décrivons le comportement asymptotique de variétés Riemanniennes simplement connexes à courbure strictement négative, dont le groupe d'isométries contient des sous-groupes discrets de co-volume fini. Plus précisément, nous montrons que lorsque la courbure est asymptotiquement 1/4-pincée, le groupe est alors divergent et la mesure de Bowen-Margulis associée est finie; de plus, le volume des boules de est asymptotiquement équivalent à la fonction , où désigne l'exposant de Poincaré de . Ce résultat généralise le célèbre théorème de Margulis au cas des réseaux non-uniformes. Nous construisons aussi toute une série d'exemples de variétés à courbure strictement négative mais non asymptotiquement 1/4-pincée, pour lesquels le volume des boules de ne croît pas toujours de façon purement exponentielle.
We study the asymptotic behavior of simply connected Riemannian manifolds of strictly negative curvature admitting a non-uniform lattice . If the quotient manifold is asymptotically -pinched, we prove that is divergent and has finite Bowen-Margulis measure (which is then ergodic and totally conservative with respect to the geodesic flow); moreover, we show that, in this case, the volume growth of balls in is asymptotically equivalent to a purely exponential function , where is the topological entropy of the geodesic flow of . This generalizes Margulis' celebrated theorem to negatively curved spaces of finite volume. In contrast, we exhibit examples of lattices in negatively curved spaces (not asymptotically -pinched) where, depending on the critical exponent of the parabolic subgroups and on the finiteness of the Bowen-Margulis measure, the growth function is exponential, lower-exponential or even upper-exponential.
Mots-clés : Cartan-Hadamard manifold, volume, entropy, Bowen-Margulis measure
@article{ASENS_2019__52_6_1459_0, author = {Dal'Bo, Fran\c{c}oise and Peign\'e, Marc and Picaud, Jean-Claude and Sambusetti, Andrea}, title = {Asymptotic geometry of negatively curved manifolds of finite volume}, journal = {Annales scientifiques de l'\'Ecole Normale Sup\'erieure}, pages = {1459--1485}, publisher = {Soci\'et\'e Math\'ematique de France. Tous droits r\'eserv\'es}, volume = {Ser. 4, 52}, number = {6}, year = {2019}, doi = {10.24033/asens.2413}, mrnumber = {4061022}, zbl = {1479.53045}, language = {en}, url = {http://www.numdam.org/articles/10.24033/asens.2413/} }
TY - JOUR AU - Dal'Bo, Françoise AU - Peigné, Marc AU - Picaud, Jean-Claude AU - Sambusetti, Andrea TI - Asymptotic geometry of negatively curved manifolds of finite volume JO - Annales scientifiques de l'École Normale Supérieure PY - 2019 SP - 1459 EP - 1485 VL - 52 IS - 6 PB - Société Mathématique de France. Tous droits réservés UR - http://www.numdam.org/articles/10.24033/asens.2413/ DO - 10.24033/asens.2413 LA - en ID - ASENS_2019__52_6_1459_0 ER -
%0 Journal Article %A Dal'Bo, Françoise %A Peigné, Marc %A Picaud, Jean-Claude %A Sambusetti, Andrea %T Asymptotic geometry of negatively curved manifolds of finite volume %J Annales scientifiques de l'École Normale Supérieure %D 2019 %P 1459-1485 %V 52 %N 6 %I Société Mathématique de France. Tous droits réservés %U http://www.numdam.org/articles/10.24033/asens.2413/ %R 10.24033/asens.2413 %G en %F ASENS_2019__52_6_1459_0
Dal'Bo, Françoise; Peigné, Marc; Picaud, Jean-Claude; Sambusetti, Andrea. Asymptotic geometry of negatively curved manifolds of finite volume. Annales scientifiques de l'École Normale Supérieure, Série 4, Tome 52 (2019) no. 6, pp. 1459-1485. doi : 10.24033/asens.2413. http://www.numdam.org/articles/10.24033/asens.2413/
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