Publications

1993

• Stability of spherical stellar systems by symplectic methods : numerical test
  
  • Perez Jérôme
  • Alimi Jean-Michel
  • Aly Jean-Jacques
  • Scholl Hans Jochen
  , 1993. We present a numerical analysis of a class of radial-anisotropic collisonless spherical stellar systems in order to understand the physical ori¬gin of the radial-orbit instability. This work is motivated by new analytical results based on the symplectic formulation of a generalised energy varia¬tionnal technique. We have obtained a first confirmation that the stability of such systems is governed by their aptitude to receive a certain class of perturbations.
• Determination of scattering frequencies for an elastic floating body
  
  • Hazard Christophe
  • Lenoir Marc
  SIAM Journal on Mathematical Analysis, Society for Industrial and Applied Mathematics, 1993, 24, pp.1458-1514.