Nonequilibrium phase transition with gravitational-like interaction in a cloud of cold atoms.

@article{Barr2013NonequilibriumPT,
  title={Nonequilibrium phase transition with gravitational-like interaction in a cloud of cold atoms.},
  author={Julien Barr{\'e} and B. Marcos and David Wilkowski},
  journal={Physical review letters},
  year={2013},
  volume={112 13},
  pages={
          133001
        }
}
We propose to use a cloud of laser-cooled atoms in a quasi-two-dimensional trap to investigate a nonequilibrium collapse phase transition in the presence of a gravitational-like interaction. Using theoretical arguments and numerical simulations, we show that, like in two-dimensional gravity, a transition to a collapsed state occurs below a critical temperature. In addition and as a signature of the nonequilibrium nature of the system, persistent particle currents, dramatically increasing close… 
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