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arXiv 2109.15218nucl-thhep-ph
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核碰撞动力学方法中空间和动量各向异性的早期行为

Early time behavior of spatial and momentum anisotropies in a kinetic approach to nuclear collisions

Marc Borrell, Nicolas Borghini

摘要:

我们推导出一个一般公式的早期时间依赖性的相空间分布演变根据动力学玻尔兹曼方程。假设在高能核碰撞中产生的系统的早期演化可以用动力学理论描述,我们计算了横向动力学的各种特征的发病标度行为。特别是,我们表明,在早期的各向异性流动系数$v_n$的标度行为不依赖于碰撞内核或系统组成的细节,而在同一时间,它不同于流体动力学的预测。

英文摘要:

We derive a general formula for the early time dependence of a phase space distribution evolving according to the kinetic Boltzmann equation. Assuming that the early evolution of the system created in high-energy nuclear collisions can be described by kinetic theory, we calculate the scaling behaviors for the onset of various characteristics of the transverse dynamics. In particular, we show that the scaling behavior of the anisotropic flow coefficients $v_n$ at early times does not depend on the details of the collision kernel or the system composition, while at the same time it differs from the prediction of fluid dynamics.

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