论文标题
一个组分的大块粘性流体向颗粒的自洽转换
Self-consistent conversion of a one-component bulk viscous fluid to particles
论文作者
论文摘要
重型离子实验与流体动力学模拟的比较需要将流体转化为颗粒。在Molnar＆Wolff，PRC 95，024903（2017）中扩展了该方法，这项工作介绍了来自动力学理论的自一致的散装粘性校正，用于具有各向异性$ 2 \至2 $交互的单组分系统。相空间校正与毕业生Ansatz以及从松弛时间近似获得的校正形成对比。另外，计算系统的块状粘度并将其与毕业结果以及$ζ\ propto（1-3 c_s^2）^2η$之间的剪切和散装粘度之间的关系（1-3 C_S^2）^2η$。还估计了各种体积校正选择对差椭圆流$ v_2（p_t）$在重离子碰撞中的可能影响。
Comparison of heavy-ion experiments to fluid dynamics simulations requires the conversion of the fluid to particles. Extending the approach in Molnar & Wolff, PRC 95, 024903 (2017), this work presents self-consistent bulk viscous corrections from kinetic theory for a one-component system with isotropic $2\to 2$ interactions. The phase space corrections are contrasted to the Grad ansatz and also to corrections obtained from the relaxation time approximation. In addition, the bulk viscosity of the system is calculated and compared with the Grad result, as well as the $ζ\propto (1 - 3 c_s^2)^2 η$ relation between shear and bulk viscosity near the conformal limit. The possible influence of various bulk correction choices on differential elliptic flow $v_2(p_T)$ in heavy-ion collisions is also estimated.
