Speed of sound in QCD matter at finite temperature and density

被引：1

作者：

Shao, Guo-yun ^{[1
]}

Yang, Xin-ran ^{[1
]}

Xie, Chong-long ^{[1
]}

He, Wei-bo ^{[2
]}

机构：

[1] Xi An Jiao Tong Univ, Sch Phys, Xian 710049, Shaaxi, Peoples R China

[2] Peking Univ, Sch Phys, Beijing 100871, Peoples R China

来源：

EUROPEAN PHYSICAL JOURNAL PLUS | 2023年 / 138卷 / 01期

基金：

中国国家自然科学基金;

关键词：

EQUATION-OF-STATE; FLUCTUATIONS; TRANSITION; MODEL;

D O I：

10.1140/epjp/s13360-023-03696-w

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The speed of sound in QCD matter at finite temperature and density is investigated within the Polyakov loop improved Nambu-Jona-Lasinio model. The spinodal structure associated with the first-order chiral phase transition is considered to describe the continuous variation of the speed of sound. The behaviors of the squared sound speed in different phases, including the stable, metastable and unstable phases, are derived. The relation between speed of sound and QCD phase transitions is systematically explored. In particular, the boundary of vanishing sound velocity is derived in the temperature-density phase diagram, and the region where the sound wave equation being broken is pointed out. Some interesting features of speed of sound under different definitions are also discussed.

引用

页数：11

共 58 条

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