For symmetric configurations, multi-solitons exist with inter-soliton distance asymptotic to λ log t, and no same-sign multi-soliton exists.
De scription and classification of 2-solitary waves for nonlinear damped Klein-Gordon equa tions
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Construction of multi solitary waves with symmetry for the damped nonlinear Klein-Gordon equation
For symmetric configurations, multi-solitons exist with inter-soliton distance asymptotic to λ log t, and no same-sign multi-soliton exists.