A detailed study of the stability of vortons
  We construct and simulate the dynamics of gauged vortons - circular loops of
cosmic string supported by the angular momentum of trapped charge and current
and provide additional details on the fully stable vorton that we have
previously presented. We find that their existence and dynamical properties can
be accurately predicted by an analysis based on infinite, straight
superconducting strings if an additional constraint on their phase frequency is
satisfied. We show a good quantitative agreement with the thin string
approximation (TSA) and provide evidence that curvature corrections are
inversely proportional to the vorton radius. This is verified with an energy
minimisation algorithm that produces vorton solutions and subsequent axial and
full three dimensional evolution codes. We find that we can predict the
frequencies of each mode of oscillation, determine which modes are unstable and
calculate the growth rate of the unstable modes to a high degree of accuracy.
