Turbulent thermalization process in heavy-ion collisions at ultrarelativistic energies
Turbulent thermalization process in heavy-ion collisions at ultrarelativistic energies
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DOI：
10.1103/physrevd.89.074011
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发表时间：
2014-04-03
影响因子：
5
通讯作者：
Venugopalan, R.
中科院分区：
文献类型：
--
作者：
Berges, J.;Boguslavski, K.;Venugopalan, R.
采用经典杨-米尔斯方程的晶格模拟，在极高能量的弱耦合极限下研究了重离子碰撞的非平衡演化。通过进行迄今为止最大规模的经典统计模拟，我们发现纵向膨胀等离子体的动力学变得独立于初始条件的细节。在由等离子体不稳定性和自由流主导的瞬态状态之后，随后的时空演化由非热固定点控制，其中系统表现出波湍流的自相似动力学特征。这使我们能够区分经典体系中的不同动力学场景。在我们模拟的准确性范围内，发现的缩放行为与“自下而上”的热化场景一致 [R. Baier、A. H. Mueller、D. Schiff 和 D. T. Son，Phys.莱特。 B 502, 51(2001)]。
The nonequilibrium evolution of heavy-ion collisions is studied in the limit of weak coupling at very high energy employing lattice simulations of the classical Yang-Mills equations. Performing the largest classical-statistical simulations to date, we find that the dynamics of the longitudinally expanding plasma becomes independent of the details of the initial conditions. After a transient regime dominated by plasma instabilities and free streaming, the subsequent space-time evolution is governed by a nonthermal fixed point, where the system exhibits the self-similar dynamics characteristic of wave turbulence. This allows us to distinguish between different kinetic scenarios in the classical regime. Within the accuracy of our simulations, the scaling behavior found is consistent with the "bottom-up" thermalization scenario [ R. Baier, A. H. Mueller, D. Schiff, and D. T. Son, Phys. Lett. B 502, 51 ( 2001)].