Transport Coefficients of Gluon Plasma

TL;DR

The results show that the ratio of the shear Viscosity to the entropy is less than one and the bulk viscosity is consistent with zero in the region 1.4 < or = T/T(c), where a new state of matter is being pursued in BNL RHIC experiments.

Abstract

Transport coefficients of gluon plasma are calculated for a SU(3) pure gauge model by lattice QCD simulations on $16^3 \times 8$ and $24^3 \times 8$ lattices. Simulations are carried out at a slightly above the deconfinement transition temperature $T_c$, where a new state of matter is currently being pursued in RHIC experiments. Our results show that the ratio of the shear viscosity to the entropy is less than one and the bulk viscosity is consistent with zero in the region, $1.4 \leq T/T_c \leq 1.8 $.

Figures (2)

• Figure 1: Numerical data points and fitting results of Matsubara Green's function $G_{12}(t)$ on a $24^3 \times 8$ lattice
• Figure 2: The ratio of the shear viscosity to the entropy as a function of $T/T_c$ KSS bound is $1/4\pi$KSS04. 'Perturbative theory' is constructed from $\eta$ in Ref.Arnold03 and $s$ in Ref.Blaizot99.