# Collision of two kinks with inner structure

## TL;DR

This paper investigates the collision dynamics of kinks with inner structure in a scalar field model, revealing complex behaviors and dependencies on model parameters through numerical simulations.

## Contribution

It introduces a scalar field model with scalar-kinetic coupling supporting structured kinks and explores their collision outcomes and parameter dependencies.

## Key findings

- Critical velocity varies with model parameters.
- Presence of two-bion escape states.
- Complex collision phenomena like intertwined states.

## Abstract

In this work, we study kink collisions in a scalar field model with scalar-kinetic coupling. This model supports kink/antikink solutions with inner structure in the energy density. The collision of two such kinks is simulated by using the Fourier spectral method. We numerically calculate how the critical velocity and the widths of the first three two bounce windows vary with the model parameters. After that, we report some interesting collision results including two-bion escape final states, kink-bion-antikink intermediate states and kink or antikink intertwined final states. These results show that kinks with inner structure in the energy density have similar properties as those of the double kinks.