Scattering of compactlike structures

TL;DR

This paper studies the collision dynamics of novel compactlike topological defects, revealing complex behaviors such as fractal escape windows, metastable formations, and the emergence of moving oscillons influenced by internal vibrational modes.

Contribution

It introduces a new class of compactlike defects with multiple internal modes and explores their collision outcomes, including metastable states and oscillons, which are novel phenomena in defect dynamics.

Findings

Existence of fractal escape windows below critical velocity.

Formation of metastable structures with fixed defect separation.

Emergence of moving oscillons that disrupt defects and depend on the control parameter.

Abstract

We investigate the collision of a new class of topological defects that tends to become compact as a control parameter increases to larger and larger values These new compactlike defects have, in general, more than one internal discrete mode depending on the value of the control parameter and, as usual, there is a critical velocity above which the defects escape after the collision. We noticed that below the critical velocity there are the windows of escape presenting fractal structure. An interesting novelty is the appearance of metastable structures with the formation of compactlike defects, maintaining a fixed distance from each other. Another new feature is the formation of boosted localized distributions of the scalar field which we called moving oscillons. These oscillons carry away almost all scalar field energy producing a complete disruption of the compactlike defects. The pattern of the moving oscillons depends on the control parameter, and becomes more complex as we increase its value. We conjecture that the new effects may be connected with the presence of more than one vibrational mode in the spectrum of the stability potential of the model under investigation.