Oscillons and Domain Walls

TL;DR

This paper investigates the formation, properties, and interactions of oscillons generated by domain wall networks in a scalar field theory, providing new insights into their spectral characteristics and collision behaviors.

Contribution

It demonstrates the production of oscillons from domain walls in 2D quartic theory and analyzes their spectral and velocity distributions, including collision dynamics.

Findings

Oscillons are produced by evolving domain wall networks.

Spectral analysis reveals their frequency characteristics.

Oscillons can pass through domain walls with minimal distortion.

Abstract

Oscillons, extremely long-lived localized oscillations of a scalar field, are shown to be produced by evolving domain wall networks in quartic theory in two spatial dimensions. We study the oscillons in frequency space using the classical spectral function at zero momentum, and obtain approximate information of their velocity distribution. In order to gain some insight onto the dilute oscillon 'gas' produced by the domain walls, we prepare a denser gas by filling the simulation volume with oscillons boosted in random directions. We finish the study by revisiting collisions between oscillons and between an oscillon and a domain wall, showing that in the latter case they can pass straight through with minimal distortion.