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

Xavier Friederich

We are interested in solutions of the nonlinear Klein-Gordon equation (NLKG) in ${\mathbb{R}}^{1+d}$, $d\ge 1$, which behave as a soliton or a sum of solitons in large time. In the sp…