论文标题
巨大的中子恒星的密集物质方程，抗kaon凝结
Dense matter equation of state of a massive neutron star with anti-kaon condensation
论文作者
论文摘要
来自几个候选者（PSR J $ 1614-2230 $，PSR J $ 0348+0432 $，MSP J $ 0740+6620 $）的中性星质量的最新测量值将其最大质量设置为此类紧凑型对象的最大质量$ \ sim 2 $ M $ m $ _ \ odot $。质量高的恒星的存在带来了物体核心区域中外来物质（超子，介子冷凝物）存在的可能性。在这项工作中，我们研究了（抗）kaon（$ k^ - ，\ bar {k}^0 $）在$β-$平衡的核物质中，在协变量密度功能理论的框架内。 Kaonic部门中的功能受到$ K^ - $ ATOMIC，KAON-NUCLEON散射数据拟合的实验研究的限制。我们发现，状态方程随着（抗）kaon冷凝水的包含而软化，从而降低了中子恒星的最大质量。在独立于密度的耦合案例之一中，$ k^ - $冷凝是通过一阶相过渡类型，该类型产生$ 2 $ M $ _ $ _ \ odot $ Neutron Star。一阶相变会导致恒星内核中的混合相区域。而$ \ bar {k}^0 $冷凝于我们在此处考虑的所有模型的二阶阶段过渡出现。
Recent measurements of neutron star mass from several candidates (PSR J$1614-2230$, PSR J$0348+0432$, MSP J$0740+6620$) set the lower bound on the maximum possible mass for this class of compact objects $\sim 2$ M$_\odot$. Existence of stars with high mass brings the possibility of existence of exotic matter (hyperons, meson condensates) at the core region of the objects. In this work, we investigate the (anti)kaon ($K^-, \bar{K}^0$) condensation in $β-$equilibrated nuclear matter within the framework of covariant density functional theory. The functionals in the kaonic sector are constrained by the experimental studies on $K^-$ atomic, kaon-nucleon scattering data fits. We find that the equation of state softens with the inclusion of (anti)kaon condensates, which lowers the maximum mass of neutron star. In one of the density-independent coupling cases, the $K^-$ condensation is through a first-order phase transition type, which produces a $2$ M$_\odot$ neutron star. The first-order phase transition results in mixed phase region in the inner core of the stars. While $\bar{K}^0$ condensation appears via second-order phase transition for all the models we consider here.
