Noise, friction and the radial-orbit instability in anisotropic stellar
  systems: stochastic N-body simulations
  By means of numerical simulations we study the radial-orbit instability in
anisotropic self-gravitating $N-$body systems under the effect of noise. We
find that the presence of additive or multiplicative noise has a different
effect on the onset of the instability, depending on the initial value of the
orbital anisotropy.
