Magnetic Component of Quark-Gluon Plasma is also a Liquid!
Abstract
The so called magnetic scenario recently suggested in LiaoESmono emphasizes the role of monopoles in strongly coupled quark-gluon plasma (sQGP) near/above the deconfinement temperature, and specifically predicts that they help reduce its viscosity by the so called "magnetic bottle" effect. Arguments for "magnetic liquid" in 1-2Tc based on lattice measurement of monopole density were provided in Chernodub. Here we present results for monopole-(anti)monopole correlation functions from the same classical molecular dynamics simulations, which are found to be in very good agreement with recent lattice results D'Alessandro:2007su. We show that the magnetic Coulomb coupling does run in the direction opposite to the electric one, as expected, and it is roughly inverse of the asymptotic freedom formula for the electric one. However, as T decreases to Tc, the magnetic coupling never gets weak, with the plasma parameter always large enough (>1). This nicely agrees with empirical evidences from RHIC experiments, implying that magnetic objects cannot have large mean free path and should also form a good liquid with low viscosity.