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arXiv 2501.07052astro-ph.HEhep-thnucl-th
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暗物质分布对中子星性质的影响

Impact of dark matter distribution on neutron star properties

Ankit Kumar, Hajime Sotani

AI总结:

本研究结合含希格斯介导相互作用的暗物质可变密度分布与重子物质RMF模型,分析暗物质密度参数对中子星结构的影响,结合观测约束缩小暗物质参数空间,为高密度环境暗物质研究提供参考。

摘要:

我们采用结合了重子物质相对论平均场(RMF)模型与暗物质(DM)可变密度分布的联合物态方程,研究暗物质对中子星的结构及可观测影响,其中纳入了由希格斯场介导的暗物质-重子相互作用。我们使用三套重子物质RMF参数集(NL3、BigApple和IOPB-I),分析质量-半径关系、最大质量和潮汐形变能力,重点关注暗物质密度标度参数($α$)和陡度参数($β$)。研究结果表明,暗物质浓度升高会显著增强中子星的致密性,改变质量-半径分布并降低潮汐形变能力。暗物质的影响强烈依赖于其密度分布的陡度:高$β$值会使暗物质被强烈约束在中子星核心内,导致星体结构更致密、形变能力更弱。来自PSR J0740+6620和GW170817的观测约束,对不同物态方程模型下的暗物质占比施加了一致的结构限制,缩小了暗物质的允许参数空间,并将$αM_χ$($M_χ$为暗物质粒子质量)与$β$的特定组合与可行的中子星结构关联起来。本研究揭示了暗物质浓度、核物质硬度与观测数据在塑造中子星结构过程中的相互作用,为未来高密度天体物理环境下的暗物质约束提供了见解。

英文摘要:

We investigate the structural and observable impacts of dark matter (DM) on neutron stars using a combined equation of state that integrates the relativistic mean field (RMF) model for baryonic matter with a variable density profile for DM, incorporating DM-baryon interactions mediated by the Higgs field. Employing three RMF parameter sets (NL3, BigApple, and IOPB-I) for baryonic matter, we analyze mass-radius relations, maximum mass, and tidal deformability, focusing on DM density scaling ($α$) and steepness ($β$) parameters. Our findings reveal that increased DM concentration significantly enhances NS compactness, shifting mass-radius profiles and reducing tidal deformability. The DM influence strongly depends on the steepness of the DM density profile, where high $β$ values lead to strongly confined DM within the NS core, resulting in more compact and less deformable configurations. Observational constraints from PSR J0740+6620 and GW170817 impose consistent structural limits on DM fractions across different equations of state models, narrowing the allowable parameter space for DM and linking specific combinations of $αM_χ$ ($M_χ$ being the mass of dark matter particle) and $β$ values to viable NS structures. This study highlights the interplay among DM concentration, nuclear stiffness, and observational data in shaping NS structure, offering insights into future constraints on DM in high-density astrophysical environments.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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