Nous démontrons que toute solution radiale d'énergie finie d'une classe générale d'équations de Klein-Gordon amorties ou bien explose en temps positif fini ou bien converge en temps positif vers une solution stationnaire dans . En particulier, toute solution globale en temps positif est bornée en temps positif. Ce résultat s'applique aux non-linéarités focalisantes, sous-critiques pour l'énergie, , , comme à toute non-linéarité, sous-critique pour l'énergie, remplissant une condition de signe de type Ambrosetti-Rabinowitz. La preuve fait appel, à la fois, à des techniques propres aux équations non linéaires dispersives et à des arguments de systèmes dynamiques (variétés invariantes dans des espaces de Banach et théorèmes de convergence).
For general nonlinear Klein-Gordon equations with dissipation we show that any finite energy radial solution either blows up in finite time or asymptotically approaches a stationary solution in . In particular, any global in positive times solution is bounded in positive times. The result applies to standard energy subcritical focusing nonlinearities , as well as to any energy subcritical nonlinearity obeying a sign condition of the Ambrosetti-Rabinowitz type. The argument involves both techniques from nonlinear dispersive PDEs and dynamical systems (invariant manifold theory in Banach spaces and convergence theorems).
Keywords: Klein-Gordon equation with dissipation, subcritical focusing nonlinearity, radial solutions, convergence, invariant manifolds, center manifolds, Ambrosetti-Rabinowitz condition, Strichartz estimates.
Mot clés : Équation de Klein-Gordon amortie, non-linéarité sous-critique focalisante, solutions radiales, convergence, variétés invariantes, variétés centrales, condition d'Ambrosetti-Rabinowitz, estimations de Strichartz.
@article{ASENS_2017__50_6_1447_0, author = {Burq, Nicolas and Raugel, Genevi\`eve and Schlag, Wilhelm}, title = {Long time dynamics for damped {Klein-Gordon} equations}, journal = {Annales scientifiques de l'\'Ecole Normale Sup\'erieure}, pages = {1447--1498}, publisher = {Soci\'et\'e Math\'ematique de France. Tous droits r\'eserv\'es}, volume = {Ser. 4, 50}, number = {6}, year = {2017}, doi = {10.24033/asens.2349}, mrnumber = {3742197}, language = {en}, url = {http://www.numdam.org/articles/10.24033/asens.2349/} }
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%0 Journal Article %A Burq, Nicolas %A Raugel, Geneviève %A Schlag, Wilhelm %T Long time dynamics for damped Klein-Gordon equations %J Annales scientifiques de l'École Normale Supérieure %D 2017 %P 1447-1498 %V 50 %N 6 %I Société Mathématique de France. Tous droits réservés %U http://www.numdam.org/articles/10.24033/asens.2349/ %R 10.24033/asens.2349 %G en %F ASENS_2017__50_6_1447_0
Burq, Nicolas; Raugel, Geneviève; Schlag, Wilhelm. Long time dynamics for damped Klein-Gordon equations. Annales scientifiques de l'École Normale Supérieure, Série 4, Tome 50 (2017) no. 6, pp. 1447-1498. doi : 10.24033/asens.2349. http://www.numdam.org/articles/10.24033/asens.2349/
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