PFH spectral invariants on the two-sphere and the large scale geometry of Hofer's metric - Archive ouverte HAL Accéder directement au contenu
Pré-Publication, Document De Travail Année : 2021

PFH spectral invariants on the two-sphere and the large scale geometry of Hofer's metric

Résumé

We resolve three longstanding questions related to the large scale geometry of the group of Hamiltonian diffeomorphisms of the two-sphere, equipped with Hofer's metric. Namely: (1) we resolve the Kapovich-Polterovich question by showing that this group is not quasi-isometric to the real line; (2) more generally, we show that the kernel of Calabi over any proper open subset is unbounded; and (3) we show that the group of area and orientation preserving homeomorphisms of the two-sphere is not a simple group. We also obtain, as a corollary, that the group of area-preserving diffeomorphisms of the open disc, equipped with an area-form of finite area, is not perfect. Central to all of our proofs are new sequences of spectral invariants over the two-sphere, defined via periodic Floer homology.

Dates et versions

hal-03436114 , version 1 (19-11-2021)

Identifiants

Citer

Sobhan Seyfaddini, Dan Cristofaro-Gardiner, Vincent Humilière. PFH spectral invariants on the two-sphere and the large scale geometry of Hofer's metric. 2021. ⟨hal-03436114⟩
9 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More