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Rigidity and L 2 cohomology of hyperbolic manifolds

Gilles Carron — 2010

Annales de l’institut Fourier

When X = Γ n is a real hyperbolic manifold, it is already known that if the critical exponent is small enough then some cohomology spaces and some spaces of L 2 harmonic forms vanish. In this paper, we show rigidity results in the borderline case of these vanishing results.

Inégalité de Sobolev et volume asymptotique

Gilles Carron — 2012

Annales de la faculté des sciences de Toulouse Mathématiques

En 1999, M. Ledoux a démontré qu’une variété complète à courbure de Ricci positive ou nulle vérifiant une inégalité de Sobolev euclidienne était euclidienne. On présente un raccourci de la preuve. De plus nos arguments permettent un raffinement d’un résultat de B-L. Chen et X-P. Zhu à propos des variétés localement conformément plate à courbure de Ricci positive ou nulle. Enfin, on étudie ce qui se passe lorsque l’hypothèse sur la courbure de Ricci est remplacée par une hypothèse sur la courbure...

Riesz transforms on connected sums

Gilles Carron — 2007

Annales de l’institut Fourier

Assume that M 0 is a complete Riemannian manifold with Ricci curvature bounded from below and that M 0 satisfies a Sobolev inequality of dimension ν > 3 . Let M be a complete Riemannian manifold isometric at infinity to M 0 and let p ( ν / ( ν - 1 ) , ν ) . The boundedness of the Riesz transform of L p ( M 0 ) then implies the boundedness of the Riesz transform of L p ( M )

On the differential form spectrum of hyperbolic manifolds

Gilles CarronEmmanuel Pedon — 2004

Annali della Scuola Normale Superiore di Pisa - Classe di Scienze

We give a lower bound for the bottom of the L 2 differential form spectrum on hyperbolic manifolds, generalizing thus a well-known result due to Sullivan and Corlette in the function case. Our method is based on the study of the resolvent associated with the Hodge-de Rham laplacian and leads to applications for the (co)homology and topology of certain classes of hyperbolic manifolds.

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