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 Astérisque 2005; 218 pp; softcover Number: 303 ISBN-10: 2-85629-186-4 ISBN-13: 978-2-85629-186-3 List Price: US$66 Individual Members: US$59.40 Order Code: AST/303 This book has two parts. The first is concerned with the differential form spectrum of congruence hyperbolic manifolds. The authors prove Selberg type theorems on the first eigenvalue of the laplacian on differential forms. The method of proof is representation-theoretic; the author hope the different chapters also serve as an introduction to the modern theory of automorphic forms and its application to spectral questions. The second part of the book has a more differential geometric flavor; a new kind of lifting of cohomology classes is proved. The main motivation of this work is given by Arthur's conjectures; these conjectures imply strong restrictions on the spectrum of arithmetic manifolds which, in turn, imply conjectural properties on the geometry of hyperbolic manifolds. Together with precise statements of these conjectures, this text gives proofs of weak forms of them in some particular cases. A publication of the Société Mathématique de France, Marseilles (SMF), distributed by the AMS in the U.S., Canada, and Mexico. Orders from other countries should be sent to the SMF. Members of the SMF receive a 30% discount from list. Readership Graduate students and research mathematicians interested in number theory. Table of Contents Partie I. Spectre des variétés hyperboliques Théorème de Matsushima Spectre du laplacien sur les quotients arithmétiques Représentations de $$\mathrm{GL}(n)$$ Représentations de $$\mathrm{U}(n,1)$$ Représentations de $$\mathrm{U}(a,b)(a,b > 1)$$ Conséquences des Conjectures d'Arthur Théorème de Luo-Rudnick-Sarnak Démonstration du Théorème 1 Démonstration du Théorème 2 Démonstration du Théorème 3 Partie II. Homologie des variétés hyperboliques L'espace hyperbolique complexe Espaces symétriques associés aux groupes unitaires Construction de la forme duale Cohomologie $$L^2$$ réduite Démonstrations des Théorèmes 4, 5 et 8 Bibliographie Index des notations Index terminologique