On uniqueness for the critical wave equation Nader Masmoudi

Niveau: Supérieur, Licence, Bac+2
On uniqueness for the critical wave equation Nader Masmoudi Courant Institute of Mathematical Sciences, 251 Mercer Street, New York NY 10012 and Fabrice Planchon Laboratoire Analyse, Geometrie & Applications UMR 7539, Institut Galilee Universite Paris 13, 99 avenue J.B. Clement 93430 Villetaneuse FRANCE Abstract We prove the uniqueness of weak solutions to the critical defocusing wave equation in 3D under a local energy inequality condition. More precisely, we prove the uniqueness of u ? L∞t (H˙1)? W˙ 1,∞t (L2), under the condition that u verifies some local energy inequalities. 1 Introduction and statement of result We consider the defocusing quintic wave equation in 3D, (1) { u+ u5 = 0, u(t = 0) = u0, ut(t = 0) = u1. Existence of global weak solutions goes back to Segal ([9], under milder as- sumptions on the nonlinearity). Existence of global smooth solutions was proved by Grillakis ([3]), while global solutions in the energy space C(R;H1)? C1(R;L2) were constructed by Shatah and Struwe [11]. Uniqueness was proved only under an additional space-time integrability of Strichartz type, 1

• weak solution


• among all weak


• local existence


• let ?


• propagation


• quintic wave


• equation


• energy density


• existence result