Long-lived oscillons from asymmetric bubbles

TL;DR

This paper demonstrates that asymmetric bubble collapses in 2+1D phi^4 models can produce long-lived, stable oscillons that are circularly symmetric and resistant to small perturbations, expanding understanding of localized field configurations.

Contribution

It shows that oscillons can originate from a wide range of asymmetric bubbles and provides numerical evidence of their stability, including against small perturbations.

Findings

Oscillons can develop from elliptically deformed bubbles.

Such oscillons are circularly symmetric.

They are linearly stable against small perturbations.

Abstract

The possibility that extremely long-lived, time-dependent, and localized field configurations (``oscillons'') arise during the collapse of asymmetrical bubbles in 2+1 dimensional phi^4 models is investigated. It is found that oscillons can develop from a large spectrum of elliptically deformed bubbles. Moreover, we provide numerical evidence that such oscillons are: a) circularly symmetric; and b) linearly stable against small arbitrary radial and angular perturbations. The latter is based on a dynamical approach designed to investigate the stability of nonintegrable time-dependent configurations that is capable of probing slowly-growing instabilities not seen through the usual ``spectral'' method.