AI 中文总结
该研究通过求解修正的托尔曼-奥本海默-沃尔科夫方程，发现暗物质混合中子星在特定参数下可形成黑洞内的中子星结构，为黑洞内部研究提供了新实例。
AI 中文摘要
我们研究暗物质混合中子星，其中中子星与由埃因斯托密度轮廓描述的各向异性暗物质晕共存，该模型最近被证明能产生规则无奇点的黑洞解[Phys. Rev. D 113, 043011 (2026)]。通过用两种不同的物态方程（BSk19和SLy4）求解修正的托尔曼-奥本海默-沃尔科夫方程，我们发现暗物质晕会显著改变中子星的结构。此外，在特定的晕参数范围内，度规分量$g_{rr}^{-1}$在恒星表面外改变符号，形成事件视界，而中子星作为规则结构持续存在于视界内部——即“黑洞内的中子星”。该结构在两种物态方程中均出现，且不依赖于特定物态方程的选择。这一发现为研究黑洞内部结构提供了新视角和具体可计算的实例。
英文摘要
We investigate dark matter admixed neutron stars in which the neutron star coexists with an anisotropic dark matter halo described by the Einasto density profile, a model recently shown to produce regular, singularity-free black hole solutions~[Phys. Rev. D \textbf{113}, 043011 (2026)]. Solving the modified Tolman--Oppenheimer--Volkoff equations with two different equations of state (BSk19 and SLy4), we find that the dark matter halo significantly alters the neutron star structure. Furthermore, for a specific range of halo parameters, $g_{rr}^{-1}$ changes sign outside the stellar surface, forming an event horizon with the neutron star persisting as a regular configuration inside it--- ``neutron stars in black holes''. This configuration appears in both equations of state and does not depend on a specific choice of the equation of state. The discovery of this configuration provides a new perspective and a concrete computable instance for the study of what lies inside a black hole.
Comments13 pages, 11 figures
