标题： 非平衡吸引子在夸克和胶子流体混合物的动理学理论中 显示英文标题

标题： Far-from-equilibrium attractors in kinetic theory for a mixture of quark and gluon fluids

摘要： 我们精确求解了一个RTA-Boltzmann方程，该方程描述了耦合的无质量夸克和胶子流体在横向均匀纵向洛伦兹不变扩张中的动力学行为。 我们引入了一个逸度参数，使得夸克可以处于化学非平衡状态，并考虑了夸克和胶子的不同碰撞速率，这些速率由Casimir标度相关联。 基于这些假设，我们数值确定了夸克和胶子分布函数的一组大量矩的演化，并重构了它们的整个分布函数。 我们发现，所有包含纵向动量平方多个幂次的分布函数矩都存在晚期和早期时间吸引子。 这些吸引子在系统进入流体力学近似适用的区域之前就已出现。 此外，我们讨论了流体混合物的剪切粘性修正和熵密度的演化，并考虑了各自吸引子的特性。 最后，还研究了不同初始动量各向异性和夸克丰度下的熵产生。 显示英文摘要

摘要： We exactly solve an RTA-Boltzmann equation that describes the dynamics of coupled massless quark and gluon fluids undergoing transversally homogeneous longitudinal boost-invariant expansion. We include a fugacity parameter that allows quarks to be out of chemical equilibrium and we account for the different collision rates of quarks and gluons, which are related by Casimir scaling. Based on these assumptions, we numerically determine the evolution of a large set of moments of the quark and gluon distribution functions and reconstruct their entire distribution functions. We find that both late and early-time attractors exist for all moments of the distribution functions containing more than one power of the squared longitudinal momentum. These attractors emerge long before the system reaches the regime where hydrodynamic approximations apply. In addition, we discuss how the shear viscous corrections and entropy density of the fluid mixture evolve and consider the properties of their respective attractors. Finally, the entropy production is also investigated for different initial values of momentum anisotropy and quark abundance.