Abstract
Flavour probes depend on the transport properties of the quark–gluon plasma. An expanding quark–gluon plasma has an anomalous viscosity, which arises from interactions with dynamically generated colour fields. The anomalous viscosity dominates over the collisional viscosity for weak coupling and at not too late times. In addition to possibly providing an explanation for the apparent nearly ‘perfect’ liquidity of the matter produced in nuclear collisions at RHIC, similar anomalous effects can affect the rate of flavour equilibration and the diffusion constant of heavy quarks.
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