arXiv 2006.092842020-06-16hep-phnucl-th

夸克-胶子等离子体的赝热化

Pseudothermalization of the quark-gluon plasma

Michael Strickland

备注：: 9 pages, 4 multipanel figures
DOI：: 10.1088/1742-6596/1602/1/012018

摘要：

在这篇论文中，我回顾了最近在动力学理论方面的工作，这表明，对于经历Bjorken膨胀的系统，在单粒子分布函数的所有时刻都存在吸引子。我将讨论如何出现这种吸引子在弛豫时间近似（RTA）和高温量子色动力学（QCD）的有效动力学理论方法得到的精确解。所用的QCD有效动力学理论碰撞核包括弹性（2 <->2）和LPM-图解非弹性（2 <->1）贡献。结果表明，RTA和QCD动力学理论中都存在一个赝热吸引子，并且它们各自的吸引子可以扩展到远离平衡态的早期.最后，我讨论了如何知识的QCD有效动力学理论吸引子可以用来评估不同的流体动力学冻结处方中使用的重离子唯象学。所获得的结果表明，改进的冻结处方，如各向异性流体力学性能更好的条件下产生的高多重数PA和PP碰撞，例如，短寿命和高的逆雷诺数。

英文摘要：

In this proceedings contribution I review recent work in kinetic theory which demonstrates that, for system undergoing Bjorken expansion, there exists an attractor in all moments of the one-particle distribution function. I discuss how this attractor emerges in both exact solutions obtained in relaxation time approximation (RTA) and the effective kinetic theory approach to high-temperature quantum chromodynamics (QCD). The QCD effective kinetic theory collisional kernel used includes both elastic (2 <-> 2) and LPM-resummed inelastic (2 <-> 1) contributions. The results obtained indicate that a pseudothermal attractor exists in both RTA and QCD kinetic theory and that their respective attractors can be extended to early times when the system is far from equilibrium. Finally, I discuss how knowledge of the QCD effective kinetic theory attractor can be used to assess different hydrodynamic freeze-out prescriptions used in heavy-ion phenomenology. The results obtained show that improved freeze-out prescriptions such as anisotropic hydrodynamics perform better in conditions corresponding to those generated in high-multiplicity pA and pp collisions, e.g. short lifetime and high inverse Reynolds number.

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