arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2212.08263nucl-thhep-ph
收藏

声速与核物质的液-气相变

Speed of sound and liquid-gas phase transition in nuclear matter

Wei-bo He, Guo-yun Shao, Chong-long Xie

摘要:

在非线性Walecka模型下,研究了有限温度和密度化学势下核物质中的声速。数值计算结果表明,声速的行为与核液-气(LG)相变和相应的旋节结构密切相关。在平均场近似中,绝热声速在临界端点(CEP)处是非零的。我们进一步导出了温度-密度相图中声速消失的边界,指出了声波方程破缺的区域。核物质和夸克物质中的声速的区别包含了关于强相互作用物质在中密度和高密度状态方程的重要信息。我们还制定了不同定义的声速之间的关系使用的基本热力学关系。

英文摘要:

We investigate the speed of sound in nuclear matter at finite temperature and density~(chemical potential) in the nonlinear Walecka model. The numerical results suggest that the behaviors of sound speed are closely related to the the nuclear liquid-gas (LG) phase transition and the associated spinodal structure. The adiabatic sound speed is nonzero at the critical endpoint (CEP) in the mean field approximation. We further derive the boundary of vanishing sound velocity in the temperature-density phase diagram, and point out the region where the sound wave equation is broken. The distinction between the speed of sound in nuclear matter and that in quark matter contains important information about the equation of state of strongly interacting matter at intermediate and high density. We also formulate the relations between differently defined speed of sound using the fundamental thermodynamic relations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑