The critical speed of a 2D binary superfluid of light is set by the lowest Landau velocity of density and spin Bogoliubov modes or by strong ellipticity of the hydrodynamic equations, with breakdown initiated by vortex-antivortex pairs or Jones-Roberts solitons.
Hakim, Nonlinear Schr¨ odinger flow past an obstacle in one dimension
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Critical speed of a binary superfluid of light
The critical speed of a 2D binary superfluid of light is set by the lowest Landau velocity of density and spin Bogoliubov modes or by strong ellipticity of the hydrodynamic equations, with breakdown initiated by vortex-antivortex pairs or Jones-Roberts solitons.