Transport Properties of QCD at Large $N_c$ and the Gauge/String Duality

Details Transport Properties of QCD at Large $N_c$ and the Gauge/String Duality Transport Properties of QCD at Large $N_c$ and the Gauge/String Duality

2009-12-24

arxiv.org/abs/0912.4824v3

Physics

High Energy Physics

High Energy Physics - Theory

10 pages, conclusions changed, references added

Scientific paper

Below the deconfinement phase transition large $N_c$ QCD is expected to be a very viscous hadronic fluid because both the shear and bulk viscosity to entropy density ratio, $\eta/s,\zeta/s \sim N_c^2$. In this letter I show that $\eta/s \sim N_c^2$ in the confined phase of holographic models of QCD at large $N_c$ defined in the supergravity approximation. Our results show that the gauge/string duality can be used to describe not only nearly perfect fluids but also extremely viscous systems such as a cold gas of glueballs.

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