论文标题
多组分二阶相对论水动力学与二元反应性碰撞
Multicomponent second-order dissipative relativistic hydrodynamics with binary reactive collisions
论文作者
论文摘要
我们使用力矩扩展方法得出了多组分二阶相对论流体动力学方程。通过使用硬球相互作用计算传输系数，我们研究了多个组件和反应性碰撞的作用。我们发现，这两个因素都会增加有效的横截面，从而减少运输系数和放松时间。我们使用前阶扰动QCD横截面进一步计算此类运输特性。对于两种类型的横截面，我们发现多组分流体的矢量电流松弛时间与电导率之间的比率与单组分流体明显不同。因此，当前的研究为现象学水动力学模拟的这种比率提供了更适合的指南。
We derive the multi-component second-order dissipative relativistic hydrodynamic equations using the moment-expansion method. By computing the transport coefficients using hard-sphere interactions, we investigate the role of multiple components and the reactive collisions. We find that both of these factors increase the effective cross-section and hence decrease the transport coefficients and relaxation times. We further compute such transport properties using leading-order perturbative QCD cross-sections. For both types of cross-sections, we find that the ratio between vector current relaxation time and conductivity for a multi-component fluid is notably different from that for a single-component fluid. Therefore, the current study provides a more applicable guideline for such a ratio in phenomenological hydrodynamics simulations.
