Kink scattering in a hybrid model

In this work we consider a model where the potential has two topological sectors connecting three adjacent minima, as occurs with the phi(6) model. In each topological sector, the potential is symmetric around the local maximum. For phi > 0 there is a linear map between the model and the lambda phi(4) model. For phi < 0 the potential is reflected. Linear stability analysis of kink and antikink lead to discrete and continuum modes related by a linear coordinate transformation to those known analytically for the lambda phi(4) model. Fixing one topological sector, the structure of antikink-kink scattering is related to the observed in the lambda phi(4) model. For kink-antikink collisions a new structure of bounce windows appear. Depending on the initial velocity, one can have oscillations of the scalar field at the center of mass even for one bounce, or a change of topological sector. We also found a structure of one-bounce, with secondary windows corresponding to the changing of the topological sector accumulating close to each one-bounce windows. The kink-kink collisions are characterized by a repulsive interaction and there is no possibility of forming a bound state. (C) 2019 Published by Elsevier B.V.