论文标题
远离平衡流体动力和梁能量扫描
Far From Equilibrium Hydrodynamics and the Beam Energy Scan
论文作者
论文摘要
快速扩展的相对论系统中流体动力吸引子的存在揭示了相对论流体动力学在描述零化学势的重离子碰撞方面的成功。随着搜索QCD临界点的搜索，重要的是要研究均衡效应如何影响QCD相图的轨迹。在此程序中，我们研究了基于DMNR运动方程的Bjorken扩展流体动力系统，在具有临界点的系统中具有最初的平衡效应和有限的化学势。我们发现，对于特定的冻结点而言，初始条件不是唯一的，而是该系统可以以广泛的初始baryon化学电位（$μ_b$）发展到相同的最终状态冻结点。对于相同的初始能量密度和重子密度，取决于系统开始的平衡多远，初始$μ_b$可以变化$Δμ_b\ sim 350 $ MEV。我们的结果表明，对初始状态中平衡效应的知识提供了影响QCD临界点的重要信息。
The existence of hydrodynamic attractors in rapidly expanding relativistic systems has shed light on the success of relativistic hydrodynamics in describing heavy-ion collisions at zero chemical potential. As the search for the QCD critical point continues, it is important to investigate how out of equilibrium effects influence the trajectories on the QCD phase diagram. In this proceedings, we study a Bjorken expanding hydrodynamic system based on DMNR equations of motion with initial out of equilibrium effects and finite chemical potential in a system with a critical point. We find that the initial conditions are not unique for a specific freeze-out point, but rather the system can evolve to the same final state freeze-out point with a wide range of initial baryon chemical potential, $μ_B$. For the same initial energy density and baryon density, depending on how far out of equilibrium the system begins, the initial $μ_B$ can vary by $Δμ_B\sim 350$ MeV. Our results indicate that knowledge of the out-of-equilibrium effects in the initial state provide vital information that influences the search for the QCD critical point.
