6 Mai 2011 adminFrumam Joan Porti – Conway spheres detected by ideal points of the character varietyCarte non disponible Date/heure Date(s) - 06/05/201111 h 00 min - 12 h 30 min Catégories Pas de Catégories This is joint work with Luisa Paoluzzi. In the 80’s Culler and Shalen found a method to construct essential surfaces from the ideal points of the variety of characters. In this talk I will review this theory and i will sketch the proof of the following theorem: the Conway spheres of a Bonahon-Siebemann decomposition of a hyperbolic link are surfaces associated to ideal points. Here a Bonahon-Siebemann decomposition is the orbifold analogue of the JSJ splitting, by considering orbifolds on the three sphere with branching locus this link. For instance, this occurs when the link has a unique Conway sphere.