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arXiv 2408.04425astro-ph.HE
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暗物质晕对X射线脉冲星脉冲轮廓的影响

Effects from Dark Matter Halos on X-ray Pulsar Pulse Profiles

Yukun Liu, Hong-Bo Li, Yong Gao, Lijing Shao, Zexin Hu

AI总结:

本研究采用广义相对论双流体形式研究带暗物质晕的暗物质混合中子星,发现其脉冲轮廓峰值流量偏差与暗晕质量-重子核半径比存在普适关系,特定参数下偏差超100%,为X射线脉冲星观测提供参考。

摘要:

中子星(NSs)因其深引力势和高密度能够捕获暗物质(DM)粒子,累积的暗物质会影响中子星的性质。本研究采用广义相对论双流体形式体系,求解含暗物质的中子星(DANSs,暗物质混合中子星)及其周围时空的结构,重点关注这类中子星拥有暗物质晕的情形。受暗物质晕的引力效应影响,X射线脉冲星的脉冲轮廓会发生改变。研究发现,脉冲轮廓的峰值流量偏差与$M_{\rm halo}/R_{\rm BM}$(即暗物质晕质量$M_{\rm halo}$与重子物质(BM)核半径$R_{\rm BM}$的比值)之间存在普适关系。结果表明,当$M_{\rm halo}/R_{\rm BM}=0.292$且暗物质粒子质量$m_f = 0.3\textrm{GeV}$时,脉冲轮廓的最大偏差可超过100%,这对X射线脉冲星观测具有参考意义。

英文摘要:

Neutron stars (NSs) can capture dark matter (DM) particles because of their deep gravitational potential and high density. The accumulated DM can affect the properties of NSs. In this work we use a general relativistic two-fluid formalism to solve the structure of DM-admixed NSs (DANSs) and the surrounding spacetime. Specifically, we pay attention to the situation where those DANSs possess DM halos. Due to the gravitational effect of the DM halo, the pulse profile of an X-ray pulsar is changed. Our study finds a universal relation between the peak flux deviation of the pulse profile and $M_{\rm halo}/R_{\rm BM}$, which is the ratio of the DM halo mass, $M_{\rm halo}$, to the baryonic matter (BM) core radius, $R_{\rm BM}$. Our results show that, when $M_{\rm halo}/R_{\rm BM}=0.292$ and the DM particle mass $m_f = 0.3\,$GeV, the maximum deviation of the profile can be larger than 100$\%$, which has implication in X-ray pulsar observation.

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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