论文标题
$ u_a（1）$在高baryon密度下的对称恢复
$U_A(1)$ symmetry restoration at high baryon density
论文作者
论文摘要
我们研究了夸克 - 梅森模型中手性与$ u_a（1）$对称性之间的关系。尽管在平均场近似中描述了夸克和介子，但表征$ u_a（1）$断裂的拓扑敏感性包括两个组成部分：一个由冷凝水控制，另一个由介子波动。 $ u_a（1）$修复受这些组件的竞争约束。在热介质中，冷凝液融化。但是，波动得到了增强。因此，$ u_a（1）$对称性不能仅通过温度效应恢复。然而，重子密度降低了冷凝水和波动，因此，$ u_a（1）$对称性只能在密集或密集和热的培养基中恢复。奇怪的冷凝水在易感性中起着弱作用，手性和$ u_a（1）$对称性修复体几乎出现在同一关键点。
We study the relation between chiral and $U_A(1)$ symmetries in the quark-meson model. Although quarks and mesons are described in mean field approximation, the topological susceptibility characterizing the $U_A(1)$ breaking comprises two components: one controlled by the condensate and the other by the meson fluctuation. The $U_A(1)$ restoration is governed by the competition of these components. In a hot medium, the condensates melt. However, the fluctuation is enhanced. Therefore, the $U_A(1)$ symmetry cannot be solely restored via the temperature effect. Nevertheless, the baryon density reduces the condensates and fluctuation, and thereby, the $U_A(1)$ symmetry can only be restored in a dense or dense and hot medium. The strange condensate plays a weak role in the susceptibility, and the chiral and $U_A(1)$ symmetry restorations occur almost at the same critical point.
