For Thursday 5 April 2018 we will discuss the following article:

• Senne Van Loon, Wout Van Alphen, Jacques Tempere, and Hadrien Kurkjian: Transition from supersonic to subsonic dispersive shock waves in superfluid Fermi gases
  

  We study the propagation of shock waves in superfluid Fermi gases in the BEC-BCS crossover. Unlike in other superfluid systems, where shock waves have already been studied and observed, Fermi gases can exhibit a subsonic dispersion relation for which the shock wave pattern appears at the tail of the wavefront. We show that this property can be used to distinguish between a subsonic and a supersonic dispersion relation at unitarity.