|Intervenant :||Jacek Jendrej|
|Institution :||Université Sorbonne Paris-Nord|
|Heure :||14h00 - 15h00|
I will present a joint work with Andrew Lawrie (MIT) on the wave maps equation from the (1+2)-dimensional space to the 2-dimensional sphere, in the case of initial data having the equivariant symmetry. We prove that every solution of finite energy converges in large time to a superposition of harmonic maps (solitons) and radiation. It was proved by Côte, and Jia and Kenig, that such a decomposition is true for a sequence of times. Combining the study of the dynamics of multi-solitons by the modulation technique with the concentration-compactness method, we prove a "non-return lemma", which allows to improve the convergence for a sequence of times to convergence in continuous time.