d-wave collapse and explosion of a dipolar Bose-Einstein condensate
  We investigate the collapse dynamics of a dipolar condensate of 52Cr atoms when the s-wave scattering length characterizing the contact interaction is reduced below a critical value. A complex dynamics, involving an anisotropic, d-wave symmetric explosion of the condensate, is observed. The atom number decreases abruptly during the collapse. We find good agreement between our experimental results and those of a numerical simulation of the three-dimensional Gross-Pitaevskii equation, including contact and dipolar interactions as well as three-body losses. The simulation indicates that the collapse induces the formation of two vortex rings with opposite circulations. 
Thierry Lahaye, Jonas Metz, Bernd Froehlich, Tobias Koch, Maximilian   Meister, Axel Griesmaier, Tilman Pfau, Hiroki Saito, ...