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Kink-kink solutions in Bogomol'nyi-Prasad-Sommerfield impurity models

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We show that BPS-impurity theories may support BPS kink-kink solutions, i.e., an energetically degenerated family of solutions describing two kinks at any mutual distance. This requires a singular impurity. As an example we consider the sine-Gordon and ϕ^{6} ... ...