论文标题
动量各向异性对Quark-Meson模型中夸克物质的影响
Effect of momentum anisotropy on quark matter in the quark-meson model
论文作者
论文摘要
我们使用2+1风味夸克 - 梅森模型中的一个各向异性参数$ξ$指定的球体动量空间各向异性研究夸克物质的手性相结构。我们发现，手性相图和关键端点（CEP）的位置受$ξ$的值显着影响。随着$ξ$的增加，CEP转移到较小的温度和较大的夸克化学势。与相应的夸克化学电位相比，CEP的温度对各向异性参数更敏感，这与研究的系统体积效应相反。此外，还研究了动量各向异性对热力学特性和标量（伪凯尔）介子质量的影响，这在消失的夸克化学势方面也得到了研究。数值结果表明，$ξ$的增加会阻碍手性对称性的恢复。我们还发现，随着$ξ$的增长，剪切粘度和电导率降低。但是，在整个感兴趣的温度域中，散装粘度表现出重要的非平凡行为。
We investigate the chiral phase structure of quark matter with spheroidal momentum-space anisotropy specified by one anisotropy parameter $ξ$ in the 2+1 flavor quark-meson model. We find that the chiral phase diagram and the location of the critical endpoint (CEP) are affected significantly by the value of $ξ$. With the increase of $ξ$, the CEP is shifted to smaller temperatures and larger quark chemical potentials. And the temperature of the CEP is more sensitive to the anisotropy parameter than the corresponding quark chemical potential, which is opposite to the study for finite system volume effect. Furthermore, the effects of momentum anisotropy on the thermodynamic properties and scalar (pseudoscalar) meson masses are also studied at vanishing quark chemical potential. The numerical results show that an increase of $ξ$ can hinder the restoration of chiral symmetry. We also find that shear viscosity and electrical conductivity decrease as $ξ$ grows. However, bulk viscosity exhibits a significant non-trivial behavior with $ξ$ in the entire temperature domain of interest.
