arXiv 0809.28692008-09-17hep-phhep-thnucl-th

搅拌强耦合等离子体

Stirring Strongly Coupled Plasma

Kazem Bitaghsir Fadafan, Hong Liu, Krishna Rajagopal, Urs Achim Wiedemann

备注：: 27 pages LaTex, 5 figures
发表信息：: Eur.Phys.J.C61:553-567,2009
DOI：: 10.1140/epjc/s10052-009-0885-6

摘要：

通过N=4超对称杨-米尔斯（SYM）理论的强耦合等离子体，确定了使测试夸克沿半径为L、角频率为w的圆运动所需的能量.我们发现，对于大多数值的L和W的能量沉积通过搅拌等离子体以这种方式要么是由阻力作用在一个测试夸克移动通过等离子体在一条直线上的速度v=LW或由一个夸克在没有任何等离子体的圆周运动辐射的能量，以较大者为准。存在从阻力主导的状态到辐射主导的状态的连续交叉。在交叉制度，我们发现的证据之间的能量损失，由于阻力和辐射，如果在真空中的显着相消干涉。因此，旋转夸克作为一个模型系统，在其中的相对强度，和相互作用，两种不同的机制的部分子能量损失是通过一个受控的经典引力计算访问。最后，我们推测了我们的结果对在等离子体中直线运动同时减速的夸克的影响，尽管在这种情况下，经典计算在与辐射主导状态相同的减速值处崩溃。

英文摘要：

We determine the energy it takes to move a test quark along a circle of radius L with angular frequency w through the strongly coupled plasma of N=4 supersymmetric Yang-Mills (SYM) theory. We find that for most values of L and w the energy deposited by stirring the plasma in this way is governed either by the drag force acting on a test quark moving through the plasma in a straight line with speed v=Lw or by the energy radiated by a quark in circular motion in the absence of any plasma, whichever is larger. There is a continuous crossover from the drag-dominated regime to the radiation-dominated regime. In the crossover regime we find evidence for significant destructive interference between energy loss due to drag and that due to radiation as if in vacuum. The rotating quark thus serves as a model system in which the relative strength of, and interplay between, two different mechanisms of parton energy loss is accessible via a controlled classical gravity calculation. We close by speculating on the implications of our results for a quark that is moving through the plasma in a straight line while decelerating, although in this case the classical calculation breaks down at the same value of the deceleration at which the radiation-dominated regime sets in.

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