Collective excitations of degenerate Fermi gases in anisotropic   parabolic traps
  The hydrodynamic low-frequency oscillations of highly degenerate Fermi gases trapped in anisotropic harmonic potentials are investigated. Despite the lack of an obvious spatial symmetry the wave-equation turns out to be separable in elliptical coordinates, similar to a corresponding result established earlier for Bose-condensates. This result is used to give the analytical solution of the anisotropic wave equation for the hydrodynamic modes. 
Andr\'as Csord\'as (Research Group for Statistical Physics of the   Hungarian Academy of Sciences,Budapest, Hungary) and Rob...