含超子和矢量门户暗物质的致密星
Hyperonic compact stars with vector portal dark matter
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中文总结 AI 辅助
本研究利用改进的夸克-介子耦合模型，引入与重子耦合的矢量门户暗物质，解决超子软化中子星物态方程的问题，使所得致密星质量符合观测约束，为检验暗区相互作用提供多信使观测途径。
中文摘要 AI 辅助
中子星核心中超子的出现通常会软化物态方程（EOS），这对观测到的双太阳质量致密星的存在构成了长期挑战。本研究探究由暗区矢量门户介导的排斥相互作用是否能提供高密度压强的额外来源，从而改变超子致密星的结构。重子部分采用改进的夸克-介子耦合（MQMC）模型描述，其中八重态重子被视为受限的相对论性组分夸克系统，在平均场近似下通过σ、ω和ρ场自洽相互作用。暗区包含一种费米型暗物质，其通过中性矢量中介子Z'与重子物质耦合，为致密物质的物态方程产生额外的排斥贡献。研究人员对所得物态方程、质量-半径关系、潮汐形变度和转动惯量进行了探究，结果表明，所得质量-半径关系符合包括PSR J0740+6620在内的大质量脉冲星的观测约束，中子星最大质量可达约2倍太阳质量。潮汐和转动可观测量的变化为通过多信使观测检验暗区相互作用提供了新途径。
英文摘要
The appearance of hyperons in the core of neutron stars generally softens the equation of state (EOS), posing a longstanding challenge to the existence of observed two-solar-mass compact stars. We investigate whether repulsive interactions mediated by a dark-sector vector portal can provide an additional source of high-density pressure and thereby modify the structure of hyperonic compact stars. The baryonic sector is described within the modified quark-meson coupling (MQMC) model, in which the octet baryons are treated as confined relativistic constituent-quark systems interacting self-consistently through the $σ$, $ω$, and $ρ$ fields within a mean field approximation. The dark sector consists of a fermionic dark matter coupled to baryonic matter through a neutral vector mediator $Z^\prime$, generating an additional repulsive contribution to the dense-matter EOS. We investigate the resulting equation of state, mass--radius relation, tidal deformability, and moment of inertia. The resulting mass--radius relations satisfy the observational bounds from massive pulsars, including PSR J0740 + 6620, with maximum neutron star masses reaching approximately $2 M_{\odot}$. The resulting changes in tidal and rotational observables provide additional avenues for testing the dark-sector interaction through multimessenger observations.
