Transport coefficients of gluonic fluid

The shear (η) and bulk (ζ) viscous coefficients have been evaluated for a gluonic fluid. The elastic, gg→gg and the inelastic, number nonconserving, gg→ggg processes have been considered as the dominant perturbative processes in evaluating the viscous coefficients to entropy density (s) ratios. Recently the processes: gg→ggg has been revisited and a correction to the widely used Gunion-Bertsch (GB) formula has been obtained. The η and ζ have been evaluated for gluonic fluid with the formula recently derived. At large αs the value of η/s approaches its lower bound, ∼1/4π.