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Compactification via le spectre réel d’espaces des classes de représentation dans SO ( n , 1 )

Taoufik Bouzoubaa (1994)

Annales de l'institut Fourier

Soit Γ un groupe de type fini non élémentaire. On note D n ( Γ ) l’ensemble des structures hyperboliques de dimension n sur Γ . D n ( Γ ) peut se réaliser comme fermé dans un espace semi-algébrique qui admet une compactification naturelle par le spectre réel. On note D n ( Γ ) sp le compactifié via le spectre _ réel de D n ( Γ ) . L’objet de cet article est de décrire les points ajoutés dans D n ( Γ ) sp . La compactification obtenue de cette manière permet d’interpréter “les points frontières” comme des représentations de Γ dans SO F + ( n , 1 ) F ( ) est un corps réel...

Compactly supported cohomology of systolic 3-pseudomanifolds

Roger Gómez-Ortells (2014)

Colloquium Mathematicae

We show that the second group of cohomology with compact supports is nontrivial for three-dimensional systolic pseudomanifolds. It follows that groups acting geometrically on such spaces are not Poincaré duality groups.

Compactness for embedded pseudoholomorphic curves in 3-manifolds

Chris Wendl (2010)

Journal of the European Mathematical Society

We prove a compactness theorem for holomorphic curves in 4-dimensional symplectizations that have embedded projections to the underlying 3-manifold. It strengthens the cylindrical case of the SFT compactness theorem [BEH+C03] by using intersection theory to show that degenerations of such sequences never give rise to multiple covers or nodes, so transversality is easily achieved. This has application to the theory of stable finite energy foliations introduced in [HWZ03], and also suggests a new...

Comparison of the refined analytic and the Burghelea-Haller torsions

Maxim Braverman, Thomas Kappeler (2007)

Annales de l’institut Fourier

The refined analytic torsion associated to a flat vector bundle over a closed odd-dimensional manifold canonically defines a quadratic form τ on the determinant line of the cohomology. Both τ and the Burghelea-Haller torsion are refinements of the Ray-Singer torsion. We show that whenever the Burghelea-Haller torsion is defined it is equal to ± τ . As an application we obtain new results about the Burghelea-Haller torsion. In particular, we prove a weak version of the Burghelea-Haller conjecture relating...

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