Collective modes as a probe of the equation of state for partially   polarized Fermi gases
  We calculate the collective modes of a partially polarized Fermi gas trapped in a spherically symmetric harmonic potential. We show that the breathing mode frequency exhibits non-monotonic dependence on polarization in the entire BCS-BEC crossover region. Moreover, we find that the breathing mode can be used to distinguish between two commonly used unitary gas equations of state. 
Theja N. De Silva, Erich J. Mueller