Perturbative QCD calculations of elliptic flow and shear viscosity in Au plus Au collisions at √sNN=200 GeV

The elliptic flow v(2) and the ratio of the shear viscosity over the entropy density, eta/s, of gluon matter are calculated from the perturbative QCD (pQCD) based parton cascade Boltzmann approach of multiparton scatterings. For Au + Au collisions at root s = 200A GeV the gluon plasma generates large v(2) values measured at the BNL Relativistic Heavy Ion Collider. Standard pQCD yields eta/s approximate to 0.08-0.15 as small as the lower bound found from the anti-de Sitter/conformal field theory conjecture.