Speed of sound in QCD matter

被引：12
作者：
He, Wei-bo [1 ,2 ]
Shao, Guo-yun [1 ]
Gao, Xue-yan [1 ]
Yang, Xin-ran [1 ]
Xie, Chong-long [1 ]
机构：
[1] Xi An Jiao Tong Univ, Sch Phys, MOE Key Lab Nonequilibrium Synth & Modulat Conden, Xian 710049, Peoples R China
[2] Peking Univ, Sch Phys, Beijing 100871, Peoples R China
来源：
PHYSICAL REVIEW D | 2022年 / 105卷 / 09期
基金：
中国国家自然科学基金;
关键词：
EQUATION-OF-STATE; PHASE-STRUCTURE; TRANSITION; COLLISIONS; DIAGRAM; MODEL;
D O I：
10.1103/PhysRevD.105.094024
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We systematically investigate the speed of sound in QCD matter under different conditions in the grand canonical ensemble within the Polyakov loop improved Nambu-Jona-Lasinio (PNJL) model. The numerical results indicate that the dependence of speed of sound on parameters like temperature and chemical potential can be indicative of QCD phase transition. Some new features of speed of sound are discovered, for instance, the hierarchy of sound velocity for u(d) and s quark at low temperature with the increasing chemical potential and the squared sound velocity approaching to almost zero in the critical region. We also formulate the relations between differently defined sound velocity using the fundamental thermodynamic relations. Some conclusions derived are useful for hydrodynamics simulation and calculation of transport coefficient of bulk viscosity.
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页数：8
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