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Groupes discrets en géométrie hyperbolique : aspects effectifs

Abstract : This thesis is concerned with two problems in real and complex hyperbolic geometry. The first problem is the study of geometric structures on moduli spaces of flat metrics on the sphere with cone singularities. W. Thurston proved that the moduli space of flat metrics on S^2 with n singularities of given angles forms a non complete complex hyperbolic manifold, and that its metric completion is a complex hyperbolic cone-manifold. In this thesis we study real forms of these complex spaces by restricting our attention to metrics that are invariant under an involution. We describe a real hyperbolic structure on moduli spaces of flat symmetric metrics of 6 (respectively 8) singularities of same angle. We describe explicitly the connected components of these spaces as dense open subsets of arithmetic hyperbolic orbifolds. We show that the metric completions of these components admit a natural gluing, and we study the structure of the glued space. The second part of this thesis is devoted to the study of limit sets of discrete subgroups of the isometry group of complex hyperbolic plane. We construct the first known explicit example of a discrete subgroup of PU(2,1) which admits a limit set homeomorphic to the Menger curve
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Jordane Granier. Groupes discrets en géométrie hyperbolique : aspects effectifs. Géométrie algébrique [math.AG]. Université de Fribourg (Suisse), 2015. Français. ⟨NNT : 2015GREAM078⟩. ⟨tel-01680209⟩



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