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Sur l'espace des surfaces à courbure et aire bornées

Christophe BavardPierre Pansu — 1988

Annales de l'institut Fourier

On attache a une surface riemannienne de diamètre grand comparé à son aire et à sa courbure un graphe qui l’approche au sens de Hausdorff-Gromov. Ceci fournit une compactification grossière de l’espace des surfaces à courbure et aire bornées. Dans le cas particulier des surfaces à courbure -1, on obtient une sorte de squelette métrique de l’espace des modules.

Flexibility of surface groups in classical simple Lie groups

Inkang KimPierre Pansu — 2015

Journal of the European Mathematical Society

We show that a surface group of high genus contained in a classical simple Lie group can be deformed to become Zariski dense, unless the Lie group is S U ( p , q ) (resp. S O * ( 2 n ) , n odd) and the surface group is maximal in some S ( U ( p , p ) × U ( q - p ) ) S U ( p , q ) (resp. S O * ( 2 n - 2 ) × S O ( 2 ) S O * ( 2 n ) ). This is a converse, for classical groups, to a rigidity result of S. Bradlow, O. García-Prada and P. Gothen.

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