A Shallow Water Analogue of the Standing Accretion Shock Instability:   Experimental Demonstration and Two-Dimensional Model
  Despite the sphericity of the collapsing stellar core, the birth conditions of neutron stars can be highly non spherical due to a hydrodynamical instability of the shocked accretion flow. Here we report the first laboratory experiment of a shallow water analogue, based on the physics of hydraulic jumps. Both the experiment and its shallow water modeling demonstrate a robust linear instability and nonlinear properties of symmetry breaking, in a system which is one million times smaller and about hundred times slower than its astrophysical analogue. 
Thierry Foglizzo (1), Fr\'ed\'eric Masset (2,1), J\'er\^ome Guilet   (3,1), Gilles Durand (1) ((1) AIM, IRFU/SAp, CEA Saclay...
astro-ph.HE physics.flu-dyn physics.pop-ph