Holographic model of superfluidity

@article{Herzog2008HolographicMO,
  title={Holographic model of superfluidity},
  author={Christopher P. Herzog and Pavel Kovtun and Dam Thanh Son},
  journal={Physical Review D},
  year={2008},
  volume={79},
  pages={066002}
}
We study a holographic model of a relativistic quantum system with a global U(1) symmetry, at nonzero temperature and density. When the temperature falls below a critical value, we find a second-order superfluid phase transition with mean-field critical exponents. In the symmetry-broken phase, we determine the speed of second sound as a function of temperature. As the velocity of the superfluid component relative to the normal component increases, the superfluid transition goes through a… 
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