On existence and uniqueness of asymptotic $N$-soliton-like solutions of the nonlinear klein-gordon equation

Xavier Friederich

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arXiv · 2106.01106

On existence and uniqueness of asymptotic $N$-soliton-like solutions of the nonlinear klein-gordon equation

Xavier Friederich

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Abstract

We are interested in solutions of the nonlinear Klein-Gordon equation (NLKG) in $\mathbb{R}^{1+d}$, $d\ge1$, which behave as a soliton or a sum of solitons in large time. In the spirit of other articles focusing on the supercritical generalized Korteweg-de Vries equations and on the nonlinear Schr{\"o}dinger equations, we obtain an $N$-parameter family of solutions of (NLKG) which converges exponentially fast to a sum of given (unstable) solitons. For $N = 1$, this family completely describes the set of solutions converging to the soliton considered; for $N\ge 2$, we prove uniqueness in a class with explicit algebraic rate of convergence.

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Xavier Friederich. 2021-06-02. On existence and uniqueness of asymptotic $N$-soliton-like solutions of the nonlinear klein-gordon equation. https://arxiv.org/abs/2106.01106

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