论文标题
核物质中的声音和液态气相变的速度
Speed of sound and liquid-gas phase transition in nuclear matter
论文作者
论文摘要
我们研究了在有限温度和密度〜（化学势）中的核物质中的声音速度。数值结果表明，声速的行为与核液体加气（LG）相变和相关的旋转结构密切相关。在平均场近似中的临界端点（CEP）处的绝热声速为非零。我们进一步得出了温度密度相图中消失的声速的边界，并指出了声波方程式破裂的区域。核物质的声音和夸克物质中的声音速度之间的区别包含有关中间和高密度上强相互作用物质状态方程的重要信息。我们还使用基本的热力学关系制定了不同定义的声音速度之间的关系。
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.
