Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2008-09-28
Physics
High Energy Physics
High Energy Physics - Theory
17 pages, 4 figures; v2 ref added; v3 small corrections, published in PRD
Scientific paper
10.1103/PhysRevD.79.066002
We study a holographic model of a relativistic quantum system with a global U(1) symmetry, at non-zero 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 tricritical point and becomes first-order.
Herzog Christopher P.
Kovtun Pavel K.
Son Dam T.
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