Recently for the sine-Gordon equation it has been established that during collisions of N slow kinks maximal energy density increases as N 2 . In this numerical study, the same scaling rule is established for the non-integrable φ4 model for N ≤5...

In this paper, we study the ϕ4 kink scattering from a spatially localized PT-symmetric defect and the effect of the kink's internal mode (IM) is discussed. It is demonstrated that if a kink hits the defect from the gain ...