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.

中文翻译：

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高温QCD血浆中的非平衡吸引子

在经历一维Bjorken扩张的弱耦合规范理论中，我们建立了一个远离平衡吸引子的存在。我们证明，由此产生的远离平衡的演化对初始条件的某些特征不敏感，包括初始动量空间各向异性和初始占有率。我们发现这种不敏感性超出了能量动量张量到单粒子分布函数的详细形式。基于我们的结果，我们评估了从能量动量张量沿吸引子重建完整的单粒子分布函数的不同程序，并讨论了超相对论核碰撞现象学分析中使用的冻结程序的含义。