Some explicit travelling-wave solutions of a perturbed sine-Gordon equation

We present in closed form some special travelling-wave solutions (on the real line or on the circle) of a perturbed sine-Gordon equation. The perturbation of the equation consists of a constant forcing term $γ$ and a linear dissipative term, and the equation is used to describe the Josephson effect in the theory of superconductors and other remarkable physical phenomena. We determine all travelling-wave solutions with unit velocity (in dimensionless units). For $|γ|$ not larger than 1 we find families of solutions that are all (except the obvious constant one) manifestly unstable, whereas for $|γ|>1$ we find families of stable solutions describing each an array of evenly spaced kinks.

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