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

• 作者: He-Xia Zhang Ben-Wei Zhang
• 来源期刊: 中国物理C（英文版）
• 年，卷（期）: 2021,（4）
• 所属期刊栏目: NUCLEAR PHYSICS
• 页码范围: 279-291
• 页数: 13页
• 语种: 英文
• DOI: 10.1088/1674-1137/abdf43

摘要

We investigate the chiral phase structure of quark matter with spheroidal momentum-space anisotropy specified by one anisotropy parameter § in the 2+1 flavor quark-meson model.We find that the chiral phase diagram and the location of the critical endpoint (CEP) are significantly affected by the value of §.With an increase in §,the CEP is shifted to lower temperatures and higher quark chemical potentials.In addition,the temperature of the CEP is more sensitive to the anisotropy parameter than the corresponding quark chemical potential,which is the opposite to that fiom the finite system volume effect.The effects of the momentum anisotropy on the thermodynamic properties and scalar (pseudoscalar) meson masses are also studied at the vanishing quark chemical potential.The numerical results reveal that an increase in § can hinder the restoration of chiral symmetry.We also find that shear viscosity and electrical conductivity decrease as § increases.However,the bulk viscosity exhibits a significant nontrivial behavior with § in the entire temperature domain of interest.