论文标题
密集不对称强相互作用的零温度热力学
Zero-temperature thermodynamics of dense asymmetric strong-interaction matter
论文作者
论文摘要
采用从强相互作用的显微镜理论得出的约束，我们估计具有两个夸克风味的密集同胞 - 反对物质的零温相结构。我们发现，沿着与天体物理应用相关的轨迹的强大相互作用事物在密度增加时经历从颜色驱动阶段到未燃料的夸克阶段的一阶相变。在同素对称物质中发现这种相变不存在。此外，通过考虑$β$平衡，电荷中立性和颜色中立性的限制，我们提供了中子星体中声速的估算值。值得注意的是，我们观察到，中子星物质中的声音速度超过了与非互动夸克气体相关的渐近值，甚至超过了较大范围内较低密度的渐近值，这与最近的等素 - 对称物质的结果一致。考虑到基于低密度的手性有效场理论的研究结果，我们的发现表明，$ n/n_0 \ lysesim 10 $的声音速度的最大值存在，其中$ n_0 $是核饱和密度。
Employing constraints derived from the microscopic theory of the strong interaction, we estimate the zero-temperature phase structure of dense isospin-asymmetric matter with two quark flavors. We find indications that strong-interaction matter along trajectories relevant for astrophysical applications undergoes a first-order phase transition from a color-superconducting phase to an ungapped quark-matter phase when the density is increased. Such a phase transition is found to be absent in isospin-symmetric matter. Moreover, by taking into account constraints from $β$-equilibrium, charge neutrality, and color neutrality, we provide an estimate for the speed of sound in neutron-star matter. Notably, we observe that the speed of sound in neutron-star matter exceeds the asymptotic value associated with the noninteracting quark gas and even increases towards lower densities across a wide range, in agreement with recent results for isospin-symmetric matter. Considering results from studies based on chiral effective field theory at low densities, our findings suggest the existence of a maximum in the speed of sound for $n/n_0 \lesssim 10$, where $n_0$ is the nuclear saturation density.
