论文标题
在不同的Knudsen数字的动力学理论中空间和动量各向异性的早期行为
Early time behavior of spatial and momentum anisotropies in kinetic theory across different Knudsen numbers
论文作者
论文摘要
我们使用固定的初始条件研究了使用各种基于粒子的运输方法的火球各向异性横向流动和空间偏心的早期发展。在从准碰撞案例到流体动力制度的数值模拟中，我们发现$ v_n $的发作以及各向异性流的相关度量可以用简单的动力法ANSATZ来描述，其指数取决于系统中的删除量。在少数响应状态中，我们基于时间的系统扩展和横截面的系统扩展，进行半分析计算，该计算可以重现数值发现。
We investigate the early time development of the anisotropic transverse flow and spatial eccentricities of a fireball with various particle-based transport approaches using a fixed initial condition. In numerical simulations ranging from the quasi-collisionless case to the hydrodynamic regime, we find that the onset of $v_n$ and of related measures of anisotropic flow can be described with a simple power-law ansatz, with an exponent that depends on the amount of rescatterings in the system. In the few-rescatterings regime we perform semi-analytical calculations, based on a systematic expansion in powers of time and the cross section, which can reproduce the numerical findings.
