论文标题
Quarkyonic Matters的排除 - 体积模型II：相位空间中重子的三种壳样分布
Excluded-volume model for quarkyonic matter II: Three-flavor shell-like distribution of baryons in phase space
论文作者
论文摘要
我们扩展了Isospin对称的两种味道密集的夸克物质的排除体积模型[Phys。 Rev. C 101，035201（2020）]包括奇怪的颗粒，并解决了其对中子星的影响。在短互动状态下的差异硬核电位定义了重子的有效尺寸。在硬核密度周围，在短距离的重子之间的排斥核心导致重子的数量密度饱和，并从下层空间产生扰动夸克，这导致Pauli排除原则导致Baryons类似壳的分布。奇怪的Quark Fermi Sea总是以高密度出现，但是仅当$λ$ hyperon的有效尺寸小于有效核子的有效尺寸时，才出现$λ$超子壳。我们发现，奇怪的Quarkyonic物质的压力可能足够大，可以支撑两次太阳能的中子星，并且可以具有较大的音速，$ C_S^2 \ simeq 0.7 $。在最庞大的中子星的内核中，扰动夸克携带的重子数的比例约为30％。
We extend the excluded-volume model of isospin symmetric two-flavor dense quarkyonic matter [Phys. Rev. C 101, 035201 (2020)] including strange particles and address its implications for neutron stars. The effective sizes of baryons are defined from the diverging hard-core potentials in the short interdistance regime. Around the hard-core density, the repulsive core between baryons at short distances leads to a saturation in the number density of baryons and generates perturbative quarks from the lower phase space, which leads to the shell-like distribution of baryons by the Pauli exclusion principle. The strange-quark Fermi sea always appears at high densities but the $Λ$ hyperon shell only appears when the effective size of the $Λ$ hyperon is smaller than the effective size of nucleons. We find that the pressure of strange quarkyonic matter can be large enough to support neutron stars with two times solar mass and can have a large sound speed, $c_s^2 \simeq 0.7$. The fraction of the baryon number carried by perturbative quarks is about 30% at the inner core of most massive neutron stars.
