1306.0214 (R. Yaresko et al.)

Equation of State and Viscosities from a Gravity Dual of the Gluon
Plasma    [PDF]

R. Yaresko, B. Kampfer

Employing new precision data of the equation of state of the SU(3) Yang-Mills theory (gluon plasma) the dilaton potential of the gravity dual is adjusted in the temperature range $(1 - 10) T_c$ in a bottom-up approach. The ratio of bulk viscosity to shear viscosity follows then as $\zeta/\eta \approx \pi \Delta v_s^2$ for $\Delta v_s^2 < 0.2$ and achieves a maximum value of 0.95 at $\Delta v_s^2 \approx 0.32$, where $\Delta v_s^2$ is the non-conformality measure, while the ratio of shear viscosity to entropy density is known as $(4 \pi)^{-1}$ for the considered special set-up with Hilbert action on the gravity side.

View original: http://arxiv.org/abs/1306.0214