论文标题
夸张的夸克扩散
Heavy quark diffusion in an overoccupied gluon plasma
论文作者
论文摘要
我们提取重夸克扩散系数κ和在远离非亚洲等离子体的远程平衡中所产生的动量扩大<p^2>。我们发现动量扩展的时间依赖性的几个特征：<p^2>的短暂初始快速生长，然后是由于langevin型动力学而导致的线性生长，并在等离子频率下这种生长围绕该增长而引起的振荡。我们表明，这些新颖的振荡不容易使用扰动技术来解释，而是由于低矩处的过量振动而导致的。因此，这些振荡是对我们先前在规格固定相关函数中观察到的红外增强的规格不变确认。我们认为，在这种IR增强的存在下，这种系统的动力学理论描述变得不那么可靠。
We extract the heavy-quark diffusion coefficient κand the resulting momentum broadening <p^2> in a far-from-equilibrium non-Abelian plasma. We find several features in the time dependence of the momentum broadening: a short initial rapid growth of <p^2>, followed by linear growth with time due to Langevin-type dynamics and damped oscillations around this growth at the plasmon frequency. We show that these novel oscillations are not easily explained using perturbative techniques but result from an excess of gluons at low momenta. These oscillation are therefore a gauge invariant confirmation of the infrared enhancement we had previously observed in gauge-fixed correlation functions. We argue that the kinetic theory description of such systems becomes less reliable in the presence of this IR enhancement.
