Dynamics of two interacting Bose-Einstein condensates
  We analize the dynamics of two trapped interacting Bose-Einstein condensates and indentify two regimes for the evolution: the regime of slow periodic oscillations and the regime of strong non-linear mixing leading to the damping of the relative motion of the condensates. We compare our predictions with an experiment recently performed at JILA. 
A. Sinatra, P.O. Fedichev, Y. Castin, J. Dalibard, and G.V.   Shlyapnikov