Abstract: A complete flat Lorentzian three-manifold is the quotient of the (2+1)-dimensional Minkowski space by a group of isometries acting properly discontinuously. If the group acting is a free group, the quotient is called a Margulis space-time. We show that (most) Margulis space-times arise as rescaled limits of collapsing manifolds modeled on anti de Sitter (AdS) geometry, a negatively curved Lorentzian model geometry. The construction is based on a new properness criterion for free groups acting on Minkowski space. This is joint work with François Guéritaud and Fanny Kassel.
Dienstag, den 23. April 2013 um 11.00 Uhr, in INF 288, HS 5 Dienstag, den 23. April 2013 at 11.00, in INF 288, HS 5
Der Vortrag folgt der Einladung von The lecture takes place at invitation by Prof. Dr. Anna Wienhard