论文标题
全息感冒密集物受到中子星的约束
Holographic cold dense matter constrained by neutron stars
论文作者
论文摘要
通过在Einstein-Maxwell-Dilaton（EMD）系统的框架中使用全息QCD模型和改进的Karch-kat-kat-katz-son-Stephanov（kksss）在物质部分的作用中，使用全息QCD模型来研究中子恒星内的状态（EOS）方程。这种描述EMD $+$ KKSS框架中全息核问题的方法与使用Dirac-Born-Infeld（DBI）动作和Chern-Simons（CS）术语不同。与Hebeler-lattimer-pethick-Schwenk（HLP）状态中间方程（EOS）结合使用，构建了中子恒星内的混合EOS。获得的杂种EOS位于由低密度手性有效理论，高密度扰动QCD和它们之间的多层插值定义的范围内，并且受天体物理学观察结果的约束。声音速度的平方在$ 2-5美元的$ 2-5 $乘以饱和的baryon数量密度的区域中达到的最大值大于$ 0.8 $，并在高巴里昂密度范围内接近保形极限。中子星的质量 - 拉迪乌斯关系和潮汐变形性与天体物理测量一致。中子星的可能最大质量约为$ 2.5 m _ {\ odot} $，半径约为$ 12 \ mathrm {km} $。据注意，大摩丁群岛关系中的全息夸克物质分支总是不稳定的，全息核物质可以产生稳定的分支。这些结果表明，即使在NS的核心中，问题仍然处于禁闭阶段，并且不受欢迎。
The equation of state (EoS) for cold dense matter inside neutron stars is investigated by using holographic QCD models in the framework of the Einstein-Maxwell-dilaton (EMD) system and the improved Karch-Katz-Son-Stephanov (KKSS) action for matter part. This method of describing holographic nuclear matter in the EMD$+$KKSS framework is different from that by using the Dirac-Born-Infeld (DBI) action and the Chern-Simons (CS) terms. Combining with the Hebeler-Lattimer-Pethick-Schwenk (HLPS) intermediate equation of state (EoS), the hybrid EoS inside the neutron stars is constructed. The obtained hybrid EoS is located in the range that is defined by the low-density chiral effective theory, the high-density perturbative QCD, and the polytropic interpolations between them, and is constrained by the astrophysics observations. The square of the sound velocity reaches a maximum value larger than $0.8$ in the region of $2-5$ times the saturation baryon number density and approaches the conformal limit at the high baryon density range. The mass-radius relation and the tidal deformability of the neutron stars are in agreement with astrophysical measurements. The possible maximum mass for the neutron star is about $2.5 M_{\odot}$ and the radius is about $12 \mathrm{km}$ then. It is noticed that the holographic quark matter branch in the mass-radius relation is always unstable and the holographic nuclear matter can produce a stable branch. These results indicate that even in the core of the NS, the matter is still in the confinement phase and the quark matter is not favored.
