For the damped nonlinear Klein-Gordon equation, all 2-solitary waves have opposite signs, the distance between solitons is asymptotically log t, and the initial data form a codimension-2 Lipschitz manifold.
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Description and classification of 2-solitary waves for nonlinear damped Klein-Gordon equations
For the damped nonlinear Klein-Gordon equation, all 2-solitary waves have opposite signs, the distance between solitons is asymptotically log t, and the initial data form a codimension-2 Lipschitz manifold.