Landau-Khalatnikov phonon damping in strongly interacting Fermi gases
  We derive the phonon damping rate due to the four-phonon Landau-Khalatnikov process in low temperature strongly interacting Fermi gases using quantum hydrodynamics, correcting and extending the original calculation of Landau and Khalatnikov [ZhETF, 19 (1949) 637]. Our predictions can be tested in state-of-the-art experiments with cold atomic gases in the collisionless regime. 
Hadrien Kurkjian (LKB (Lhomond)), Yvan Castin (LKB (Lhomond)), Alice   Sinatra (LKB (Lhomond))
cond-mat.quant-gas