M. Axenides a, S. Komineasb,
L. Perivolaropoulosa, M. Floratosa aInstitute of Nuclear Research, N.C.R.P.S. Demokritos, 15310 Athens, Greece bPhysikalisches Institut, Universitat Bayreuth D-95440 Bayreuth, Germany
Abstract
We use numerical simulations and semi-analytical methods to
investigate the stability and the interactions of nontopological
stationary qball solutions. In the context of a simple model we
map the parameter sectors of
stability for a single qball and verify the result using numerical
simulations of time evolution. The system of two interacting
qballs is also studied in one and two space dimensions. We find
that the system generically performs breather type oscillations
with frequency equal to the difference of the internal qball
frequencies. This result is shown to be consistent with the form
of the qball interaction potential. Finally we perform simulations
of qball scattering and show that the right angle scattering
effect observed in topological soliton scattering in two dimensions,
persists also in
the case of qballs where no topologically conserved quantities are
present. For relativistic collision velocities the qball charge is
split into a forward and a right angle scattering component. As
the collision velocity increases, the forward component gets
amplified at the expense of the right angle component.