Universal attractor in a highly occupied non-Abelian plasma
Universal attractor in a highly occupied non-Abelian plasma
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DOI：
10.1103/physrevd.89.114007
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发表时间：
2014-06-05
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.
研究了弱耦合下高占非阿贝尔等离子体的热化过程。这种系统的非平衡动力学本质上是经典的，可以用实时格点规范理论技术模拟。我们提供了一个详细的讨论，这一框架，并阐述了报告的结果在J。Boguslavski，S. Schlichting和R. Venugopalan，Phys. Rev. D 89，074011（2014）沿着新发现。我们证明了普遍吸引子解决方案的出现，这管理非膨胀和膨胀非阿贝尔等离子体在大的时间尺度上的非平衡演化。非膨胀等离子体的湍流吸引子驱动系统在类似于Q（-1）alpha（-7/4）（s）的时间尺度t上接近热平衡。膨胀的非阿贝尔等离子体的吸引子解导致在向低占有率或量子制度的过渡处的强相互作用的尽管高度各向异性的系统。在我们模拟的不确定性范围内，经典区域的这种演化与“自下而上”热化的情景是一致的[R。Baier，A. H.米勒，D。Schiff和D. T.儿子，物理学快报。B 502，51（2001）]。虽然本文的重点是了解弱耦合渐近的非平衡动力学，我们也讨论了我们的结果的相关性较大的耦合在早期的重离子碰撞实验的动力学。
We study the thermalization process in highly occupied non-Abelian plasmas at weak coupling. The nonequilibrium dynamics of such systems is classical in nature and can be simulated with real-time lattice gauge theory techniques. We provide a detailed discussion of this framework and elaborate on the results reported in J. Berges, K. Boguslavski, S. Schlichting, and R. Venugopalan, Phys. Rev. D 89, 074011 (2014) along with novel findings. We demonstrate the emergence of universal attractor solutions, which govern the nonequilibrium evolution on large time scales both for nonexpanding and expanding non-Abelian plasmas. The turbulent attractor for a nonexpanding plasma drives the system close to thermal equilibrium on a time scale t similar to Q(-1)alpha(-7/4)(s). The attractor solution for an expanding non-Abelian plasma leads to a strongly interacting albeit highly anisotropic system at the transition to the low-occupancy or quantum regime. This evolution in the classical regime is, within the uncertainties of our simulations, consistent with the "bottom up" thermalization scenario [R. Baier, A. H. Mueller, D. Schiff, and D. T. Son, Phys. Lett. B 502, 51 (2001)]. While the focus of this paper is to understand the nonequilibrium dynamics in weak coupling asymptotics, we also discuss the relevance of our results for larger couplings in the early time dynamics of heavy ion collision experiments.