Anomalous viscosity of an expanding quark-gluon plasma.
Anomalous viscosity of an expanding quark-gluon plasma.
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DOI：
10.1103/physrevlett.96.252301
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发表时间：
2006-03
影响因子：
8.6
通讯作者：
Masayuki Asakawa;Steffen A. Bass;Berndt Müller
中科院分区：
文献类型：
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作者：
Masayuki Asakawa;Steffen A. Bass;Berndt Müller
我们认为膨胀的夸克-胶子等离子体具有异常粘度，这是由与动态产生的色场相互作用引起的。我们推导了紊流等离子体域中反常粘度的表达式，并将其应用于夸克-胶子等离子体接近平衡时的流体动力膨胀阶段。在弱耦合和不太迟的时间内，反常粘度比碰撞粘度占主导地位。这种效应可以解释在相对论重离子对撞机的核碰撞中产生的物质表面上“近乎完美”的流动性，而无需假设它是强耦合状态。
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.