Transport Coefficients of Gluon Plasma

TL;DR

This study uses lattice QCD simulations to calculate the transport coefficients of gluon plasma near the deconfinement transition, revealing a low shear viscosity to entropy ratio and negligible bulk viscosity.

Contribution

It provides the first lattice QCD estimates of gluon plasma transport coefficients near the transition temperature, enhancing understanding of quark-gluon plasma properties.

Findings

Shear viscosity to entropy ratio is less than one.

Bulk viscosity is consistent with zero.

Results are obtained for temperatures 1.4 to 1.8 times T_c.

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 $.