论文标题
相对论重离子碰撞中的热和粘性耗散
Thermal and viscous dissipation in relativistic heavy ion collisions
论文作者
论文摘要
我们研究了有限的重子密度和温度对二阶耗散性流体动力学内相对论重离子碰撞中物质的块状特性的影响。热流和剪切应力张量的相对论流体进化方程是通过使用Grad的14摩托近似来得出的，用于单粒子相位空间分布函数。与基于熵原理相比，新方程提供了许多与热剪切耦合相关的其他术语。耗散方程在非升级不变的流体动力模型模拟中编码，并研究了RHIC的Beam Energy扫描程序中遇到的高baryon密度物质的演变。我们发现，热耗散在定义低能量下的散装可观察力方面主导了剪切压力，但其效果在超偏见的能量下会降低。
We investigate the effects of finite baryon density and temperature on the bulk properties of matter formed in relativistic heavy ion collisions within second-order dissipative hydrodynamics. The relativistic fluid evolution equations for heat flow and shear stress tensor are derived from kinetic theory by using Grad's 14-moment approximation for the single-particle phase-space distribution function. The new equations provide a number of additional terms associated with heat-shear couplings as compared to the existing derivations based on entropy principle. The dissipative equations are encoded in non-boost-invariant hydrodynamic model simulation and studied for the evolution of high baryon density matter encountered at the beam energy scan program at RHIC. We find that thermal dissipation dominates shear pressure in defining the bulk observables at the low energy but its effect diminishes at ultra-relativistic energies.
