Thermodynamics of partonic matter in relativistic heavy-ion collisions from a multiphase transport model
Thermodynamics of partonic matter in relativistic heavy-ion collisions from a multiphase transport model
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DOI：
10.1103/physrevc.105.034912
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发表时间：
2021-02
影响因子：
3.1
通讯作者：
Han-Sheng Wang;G. Ma;Zi-Wei Lin;Wei-jie Fu
中科院分区：
文献类型：
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作者：
Han-Sheng Wang;G. Ma;Zi-Wei Lin;Wei-jie Fu
利用弦熔化的多相输运模型，我们着重研究了Au+Au碰撞产生的部分子物质中心晶胞的热力学性质的演化。基于玻尔兹曼和量子统计计算了温度和化学势，以确定它们在QCD相图中的演化轨迹。我们证明了轨迹可以依赖于许多物理因素，特别是在较低能量下的finite核厚度。然而，从压力各向异性的演化来看，当部分子系统达到预测的QCD相界时，只能实现部分热化。这对利用相对论重离子碰撞研究QCD相结构提供了一些有益的启示。
Using the string melting version of a multiphase transport model, we focus on the evolution of thermodynamic properties of the central cell of parton matter produced in Au+Au collisions ranging from 200 GeV down to 2.7 GeV. The temperature and chemical potentials have been calculated based on both Boltzmann and quantum statistics in order to locate their evolution trajectories in the QCD phase diagram. We demonstrate that the trajectories can depend on many physical factors, especially the finite nuclear thickness at lower energies. However, from the evolution of pressure anisotropy, only partial thermalization can be achieved when the partonic systems reach the predicted QCD phase boundary. It provides some helpful insights to studying the QCD phase structure through relativistic heavy-ion collisions.