含反常流粲夸克偶素扩散系数的全息研究

Holographic Study of Diffusion Coefficients of Charmonium with Anomalous Flow

针对现有相对论重离子碰撞实验所产生的强磁场大小和范围,等离子体由于强磁场和轴向电荷不平衡而形成反常流.研究中利用规范/引力对偶全息分析方法,在强磁场情况下,强耦合手征等离子体粲夸克偶素在轴向电荷不平衡时的扩散系数随磁场和温度的变化关系,从而研究系统各向异性程度随磁场和温度的依赖关系.研究结果表明:受反常流的影响,在低温区域,粲夸克偶素沿磁场方向各向异性程度对温度、磁场和拖曳速度的变化都比较敏感.而当温度升到一定大小时,无论磁场或拖曳速度如何变化,系统均能够达到各向同性.这说明在高温背景下,强相互作用的温度场占支配地位,对应的磁场作用几乎可以忽略.

The plasma anomalous flow is formed due to the strong magnetic field and the axial charge imbalance in view of the size and range of the strong magnetic field produced by the relativistic heavy ion collision experiments.A holographic gauge/gravity dual method is used to study the dependence of the magnetic field and temperature on the diffusion coefficient of the charmonium in the paper.The results show that the anisotropy of charmonium along the magnetic field is sensitive to temperature,magnetic field and drag velocity in the low temperature region.When the temperature rises to a certain value,the system can reach isotropy no matter how the magnetic field or the drag velocity changes.This shows that the strong interaction temperature field is dominant in the high temperature background,and the corresponding magnetic field effect is almost negligible.