INELASTIC COLLISION OF KINKS AND ANTIKINKS IN THE φ6 SYSTEM

In this paper, we study the kink-antikink interaction in the phi(6) system. This system has soliton-like solutions which fall into two categories with opposite topological charges. We consider the interaction of a kink solution with an antikink at different incident energies (velocities) and observe the outcome. In general, the collision is inelastic. There are two critical velocities v(1) and v(2) in the system, between which there are enormous number of narrow scattering windows. We study the fractal-like structure of the windows. Below v(1) the pair are absorbed into each other. Above v(1) the pair get separated after the inelastic interaction. Finally, we obtain the internal modes of the kink in this system and address its relevance to the interaction behavior.