论文标题
改进的各向异性流体动力学ANSATZ
An improved anisotropic hydrodynamics ansatz
论文作者
论文摘要
我们引入了各向异性流体动力分布功能的改进形式，该功能明确考虑了自由流和平衡的贡献。我们证明，通过这种改进，文献中可以更好地再现分布功能矩的演变的精确结果，特别是对于矩的矩，它们的定义中没有纵向动量的力量（M = 0矩）。使用所得的动态方程式，我们提取与改进的Ahydro Ansatz相关的非平衡吸引子，并证明改进还允许人们更好地再现在松弛时间近似中使用动力学理论获得的确切动力学吸引子，尤其是在早期重新恢复的时间和M = 0时。
We introduce an improved form for the anisotropic hydrodynamics distribution function which explicitly takes into account the free-streaming and equilibrating contributions separately. We demonstrate that with this improvement one can better reproduce exact results available in the literature for the evolution of moments of the distribution function, in particular, for moments which contain no powers of the longitudinal momentum in their definition (m=0 moments). Using the resulting dynamical equations, we extract the non-equilibrium attractor associated with our improved aHydro ansatz and demonstrate that the improvement also allows one to better reproduce the exact dynamical attractor obtained using kinetic theory in the relaxation time approximation, particularly at early rescaled times and for m=0 moments.
