重离子碰撞能量扫描中的新物理研究

本课题“重离子碰撞能量扫描中的新物理研究” 运用描述重离子碰撞的流体力学模型和输运模型讨论手征磁效应以及流体涡旋度在能量扫描中的信号演化；并运用AdS/QCD全息对偶方法和手征有效模型讨论有限重子密度区间相结构。主要围绕三个方面来开展研究工作：1. 系统研究强磁场这一在重离子碰撞早期存在的极端外条件所导致的可观测效应对不同碰撞能区的时间依赖性，并运用于定量计算手征磁效应在能量扫描中的信号演化；2. 深入定量研究重离子碰撞中另一种新型极端外条件，即流体涡旋度(vorticity)在各种不同碰撞系统中从高能区到低能区的演化，并特别关注流体涡旋度所导致的粒子极化信号以及对热密物质相结构的影响；3.利用非微扰物理AdS/QCD模型对于能量扫描实验中所能观测到的高重子密度区间相结构（临界点和一级相变线）进行研究，并分析研究有限重子密度物质的相关热力学和输运性质。

Our research titled “A new physical study on beam energy scanning in heavy ion collisions” makes a study on the chiral magnetic effect and the fluid vorticity in the evolution of beam energy scanning by using the fluid mechanics model and transport signal models of heavy ion collisions, and then investigates theoretically QCD phase structure (critical end point and first order phase transition) of the high baryon density by using the AdS/QCD holographic duality method and the chiral effective model. Our research mainly carries out the following three aspects of work: 1. We will study systematically the time-dependent effects of magnetic field and some observable effects related with magnetic field with different collision energy systems given by extreme external conditions at the early stage of heavy ion collisions. The signal evolution of chiral magnetic effect given by beam energy scanning is quantitatively studied in this project. 2. We will make further quantitative study of new extreme external conditions, namely the fluid vorticity in different heavy ion collision systems. And special attention is paid to the polarization signal of the particle and the effect on the phase structure of the thermally dense material caused by the fluid vorticity . 3. The non-perturbative AdS/QCD model is used to study the phase structure (critical end point and first-order phase transition line) during high baryon density interval observed in beam energy scanning experiments, and the related thermodynamics and transport properties of finite baryon density matter are analyzed.