Anomalous Viscosity of an Expanding Quark-Gluon Plasma

Details Anomalous Viscosity of an Expanding Quark-Gluon Plasma Anomalous Viscosity of an Expanding Quark-Gluon Plasma

2006-03-12

arxiv.org/abs/hep-ph/0603092v2

Phys.Rev.Lett.96:252301,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

Final version accepted for publication

Scientific paper

10.1103/PhysRevLett.96.252301

We argue that an expanding quark-gluon plasma has an anomalous viscosity, which arises from interactions with dynamically generated color fields. We derive an expression for the anomalous viscosity in the turbulent plasma domain and apply it to the hydrodynamic expansion phase, when the quark-gluon plasma is near equilibrium. The anomalous viscosity dominates over the collisional viscosity for weak coupling and not too late times. This effect may provide an explanation for the apparent ``nearly perfect'' liquidity of the matter produced in nuclear collisions at the Relativistic Heavy Ion Collider without the assumption that it is a strongly coupled state.

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