Nonequilibrium Attractor in High-Temperature QCD Plasmas
Nonequilibrium Attractor in High-Temperature QCD Plasmas
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DOI：
10.1103/physrevlett.125.122302
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发表时间：
2020-09-17
影响因子：
8.6
通讯作者：
Strickland, Michael
中科院分区：
文献类型：
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作者：
Almaalol, Dekrayat;Kurkela, Aleksi;Strickland, Michael
我们在一维Bjorken展开的弱耦合规范理论中建立了远离平衡吸引子的存在性。我们证明，由此产生的远离平衡的演变是不敏感的初始条件的某些功能，包括初始动量空间各向异性和初始占用。我们发现，这种不敏感性超出了能量动量张量的详细形式的单粒子分布函数。基于我们的研究结果，我们评估了不同的程序重建完整的单粒子分布函数从能量-动量张量沿着吸引子和讨论的影响，用于超相对论性核碰撞的唯象分析的冻结程序。
We establish the existence of a far-from-equilibrium attractor in weakly coupled gauge theory undergoing one-dimensional Bjorken expansion. We demonstrate that the resulting far-from-equilibrium evolution is insensitive to certain features of the initial condition, including both the initial momentum-space anisotropy and initial occupancy. We find that this insensitivity extends beyond the energy-momentum tensor to the detailed form of the one-particle distribution function. Based on our results, we assess different procedures for reconstructing the full one-particle distribution function from the energy-momentum tensor along the attractor and discuss implications for the freeze-out procedure used in the phenomenological analysis of ultrarelativistic nuclear collisions.