Philippe G. LeFloch
Université Pierre et Marie Curie, Paris 6
4 novembre 2016 de 16 h 00 à 18 h 00 (heure de Montréal/HNE) Sur place
will review results on the global evolution of selfgravitating massive matter in the context of Einstein's theory as well as the f(R)theory of gravity. In collaboration with Yue Ma (Xian), I have investigated the global existence problem for the Einstein equations coupled with a KleinGordon equation describing the evolution of a massive scalar field. Our main theorem establishes the global nonlinear stability of Minkowski spacetime upon small perturbations of the metric and the matter field. Recall that the fully geometric proof by Christodoulou and Klainerman in 1993, as well as the proof in wave gauge by Lindblad and Rodnianski in 2010, both apply to vacuum spacetimes and massless fields only. Our new technique of proof, which we refer to as the Hyperboloidal Foliation Method, does not use Minkowski's scaling field and is based on a foliation of the spacetime by asymptotically hyperboloidal spacelike hypersurfaces, on sharp estimates for wave and KleinGordon equations, and on an analysis of the quasinull hyperboloidal structure (as we call it) of the Einstein equations in wave gauge.
AdresseCRM, Pavillon André-Aisenstadt, 2920 chemin de la tour, salle 6254