Nonlinear stability of 2-solitons of the sine-Gordon equation in the energy space

Muñoz, Claudio; Palacios, José M.

doi:10.1016/j.anihpc.2018.10.005

Muñoz, Claudio ¹ ; Palacios, José M.²

¹ CNRS and Departamento de Ingeniería Matemática and Centro de Modelamiento Matemático (UMI 2807 CNRS), Universidad de Chile, Casilla 170 Correo 3, Santiago, Chile
² Departamento de Ingeniería Matemática DIM, Universidad de Chile, Chile

Annales de l'I.H.P. Analyse non linéaire, Tome 36 (2019) no. 4, pp. 977-1034.

Résumé

In this article we prove that 2-soliton solutions of the sine-Gordon equation (SG) are orbitally stable in the natural energy space of the problem $H^{1} \times L^{2}$ . The solutions that we study are the 2-kink, kink–antikink and breather of SG. In order to prove this result, we will use Bäcklund transformations implemented by the Implicit Function Theorem. These transformations will allow us to reduce the stability of the three solutions to the case of the vacuum solution, in the spirit of previous results by Alejo and the first author [3], which was done for the case of the scalar modified Korteweg–de Vries equation. However, we will see that SG presents several difficulties because of its vector valued character. Our results improve those in [5], and give the first rigorous proof of the nonlinear stability in the energy space of the SG 2-solitons.

DOI : 10.1016/j.anihpc.2018.10.005

Mots-clés : Sine-Gordon, Stability, Breathers, 2-kink, Kink–antikink, Modified KdV

Affiliations des auteurs :

Muñoz, Claudio ¹ ; Palacios, José M. ²

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     title = {Nonlinear stability of 2-solitons of the {sine-Gordon} equation in the energy space},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
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Muñoz, Claudio; Palacios, José M. Nonlinear stability of 2-solitons of the sine-Gordon equation in the energy space. Annales de l'I.H.P. Analyse non linéaire, Tome 36 (2019) no. 4, pp. 977-1034. doi : 10.1016/j.anihpc.2018.10.005. https://www.numdam.org/articles/10.1016/j.anihpc.2018.10.005/

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