Impact of dark matter on strange quark stars described by different quark models

Yida Yang, Chen Wu, Ji-Feng Yang
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Abstract

Dark matter is hypothesized to interact with ordinary matter solely through gravity and may be present in compact objects such as strange quark stars. We treat strange quark stars admixed with dark matter as two-fluid systems to investigate the potential effects of dark matter on strange quark stars. Quark matter is described by the quasiparticle model and the extended MIT bag model for comparison. Dark matter is treated as asymmetric, self-interacting, and composed of massive fermionic particles. The two-fluid Tolman-Oppenheimer-Volkoff (TOV) equations are employed to solve for specific stellar properties. Our analysis yields relations between central energy density and mass, radius and mass, as well as tidal deformability and mass. The calculated curves generally align with observational data. In particular, we find that the pattern in which fermionic asymmetric dark matter affects the properties of strange quark stars may not be influenced by the equation of state (EOS) of strange quark matter.
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暗物质对不同夸克模型描述的奇异夸克星的影响
根据假设,暗物质仅通过引力与普通物质相互作用,并可能存在于奇异夸克星等紧凑物体中。为了研究暗物质对奇异夸克星的潜在影响,我们将奇异夸克星与暗物质混合视为双流体系统。夸克物质由准粒子模型和扩展的 MIT 袋模型描述,以作比较。暗物质被视为不对称的、自相互作用的、由大质量费米子粒子组成的物质。采用双流体托尔曼-奥本海默-沃尔科夫(TOV)方程来求解特定的恒星特性。我们的分析得出了中心能量密度与质量、半径与质量以及潮汐变形能力与质量之间的关系。计算出的曲线与观测数据基本吻合。特别是,我们发现费米不对称暗物质影响奇异夸克星性质的模式可能不受奇异夸克物质状态方程(EOS)的影响。
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