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北美退伍军人节(Veterans Day),12 日无更新
arXiv 2007.13580hep-phnucl-th
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夸克-介子模型中动量各向异性对夸克物质的影响

Effect of momentum anisotropy on quark matter in the quark-meson model

He-Xia Zhang, Ben-Wei Zhang

摘要:

在2+1味夸克-介子模型中,研究了具有由各向异性参数$ξ$指定的球体动量-空间各向异性的夸克物质的手征相结构。发现$ξ$的大小对手性相图和临界终点位置有很大的影响。随着$ξ$的增加,CEP向更小的温度和更大的夸克化学势移动。CEP的温度对各向异性参数比相应的夸克化学势更敏感,这与有限系统体积效应的研究相反。此外,还研究了夸克化学势为零时动量各向异性对热力学性质和标量(赝标)介子质量的影响。数值结果表明,$ξ$的增加会阻碍手征对称性的恢复.我们还发现,随着$ξ$的增长,剪切粘度和电导率降低。然而,体积粘度表现出显着的非平凡的行为与$ξ$在整个温度域的利益。

英文摘要:

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.

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