Hofer's metrics and boundary depth
[Métriques de Hofer et profondeur de bord]
Annales scientifiques de l'École Normale Supérieure, Série 4, Tome 46 (2013) no. 1, pp. 57-129.

Nous montrons que si (M,ω) est une variété symplectique fermée qui admet un champ vectoriel hamiltonien non-trivial dont toutes les orbites fermées contractiles sont constantes, la métrique de Hofer sur le groupe des difféomorphismes hamiltoniens de (M,ω) a alors un diamètre infini et admet donc des espaces vectoriels normés plongés quasi-isométriquement et de dimension infinie. Une conclusion semblable s’applique à la métrique de Hofer sur différents espaces de sous-variétés lagrangiennes, y compris les sous-variétés hamiltoniennes isotopiques à la diagonale en M×MM satisfait à la condition dynamique ci-dessus. Pour prouver cela, nous utilisons les propriétés d’une quantité Floer-théorique appelée profondeur de bord, qui mesure la non-trivialité de l’opérateur limite sur le complexe de Floer de manière à encoder des informations robustes de topologie symplectique.

We show that if (M,ω) is a closed symplectic manifold which admits a nontrivial Hamiltonian vector field all of whose contractible closed orbits are constant, then Hofer’s metric on the group of Hamiltonian diffeomorphisms of (M,ω) has infinite diameter, and indeed admits infinite-dimensional quasi-isometrically embedded normed vector spaces. A similar conclusion applies to Hofer’s metric on various spaces of Lagrangian submanifolds, including those Hamiltonian-isotopic to the diagonal in M×M when M satisfies the above dynamical condition. To prove this, we use the properties of a Floer-theoretic quantity called the boundary depth, which measures the nontriviality of the boundary operator on the Floer complex in a way that encodes robust symplectic-topological information.

DOI : 10.24033/asens.2185
Classification : 53D22, 53D40
Keywords: Hofer metric, hamiltonian diffeomorphism, lagrangian submanifold, Floer complex
Mot clés : métrique de Hofer, difféomorphisme hamiltonien, sous-variété lagrangienne, complexe de Floer
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Usher, Michael. Hofer's metrics and boundary depth. Annales scientifiques de l'École Normale Supérieure, Série 4, Tome 46 (2013) no. 1, pp. 57-129. doi : 10.24033/asens.2185. http://www.numdam.org/articles/10.24033/asens.2185/

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