| 用中子星限制暗物质粒子散射截面 |
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| 引用本文： | 王弋尘,缪雪丽,邵立晶.用中子星限制暗物质粒子散射截面[J].天文学报,2021,62(5):54. |
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| 作者姓名： | 王弋尘 缪雪丽 邵立晶 |
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| 作者单位： | 北京大学物理学院北京100871;;北京大学物理学院北京 100871;;北京大学科维理天文与天体物理研究所北京100871;中国科学院国家天文台北京100012 |
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| 基金项目： | 国家自然科学基金项目(11975027、11991053、11721303), SKA专项(2020SKA0120300), 中国科协青年人才托举工程(2018QNRC001), "马普伙伴合作组"和北京大学"本科生科研训练"校长基金项 目资助 |
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| 摘 要： | 中子星可以通过重子物质和暗物质的相互作用吸积暗物质,且在一定条件下, 中子星吸积的暗物质粒子可以引发自引力塌缩形成小型黑洞, 生成的黑洞可能会进一步吞噬中子星.依据文献已有模型, 基于以上物理过程给出了在暗物质粒子不同质量下对暗物质粒子--中子的散射截面的限制.使用弱相互作用大质量粒子(Weakly Interacting Massive Particle, WIMP)模型, 并考虑暗物质粒子是玻色子的情形, 讨论了暗物质粒子有无自相互作用以及有无湮灭等条件下对限制暗物质参数的影响.既考虑了已发现的两个中子星系统来给出对暗物质参数空间的限制,也考虑了两个可能存在的年老中子星来预测未来观测可能对暗物质参数空间的限制.对于考虑玻色--爱因斯坦凝聚(Bose-Einstein Condensate, BEC)的玻色子暗物质, 在无自相互作用或有弱自相互作用, 无湮灭或有很小湮灭截面的条件下,中子星给出的间接观测对暗物质粒子-中子散射截面的限制的强度比XENON1T直接探测实验来得更强.未来, 如果在银心附近能观测到年老中子星, 其观测结果可以提升模型给出的对暗物质粒子--中子散射截面的限制, 从而帮助人们进一步理解暗物质.
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| 关 键 词： | 恒星: 中子 宇宙学: 暗物质 弱相互作用大质量粒子 暗物质粒子-中子散射截面 |
| 收稿时间： | 2019/10/1 0:00:00 |
Constraining Dark Matter Particles' Cross-section with Neutron Stars |
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| WANG Yi-chen,MIAO Xue-li,SHAO Li-jing.Constraining Dark Matter Particles' Cross-section with Neutron Stars[J].Acta Astronomica Sinica,2021,62(5):54. |
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| Authors: | WANG Yi-chen MIAO Xue-li SHAO Li-jing |
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| Institution: | School of Physics, Peking University, Beijing 100871; Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871;National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 |
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| Abstract: | Neutron stars can accrete dark matter particles by the interaction between baryonic matter and dark matter. Under certain conditions, dark matter particles accreted by a neutron star can induce gravitational collapse and then form a small black hole, which may grow and consume the neutron star. In this paper, based on the present model, we obtain constraints on the dark matter particle -- neutron cross-section at different dark matter particle masses. We adopt the Weakly Interacting Massive Particle (WIMP) model and consider that dark matter particles are bosons. We get how self-interaction and annihilation of dark matter particles impact the constraints on dark matter.We consider two existing neutron stars to bound the parameter space of dark matter. In addition,we consider two hypothetical neutron stars, which could be detected in the future. We predict possible constraints on the parameter space of dark matter.For bosonic dark matter particles which can form Bose-Einstein Condensate (BEC), assuming that there is no or only weak self-interaction and weak annihilation,we find that constraints from neutron stars are stronger than their direct detection experiments including XENON1T.Future detection of old neutron stars near the Galactic center may improve the bounds of parameter of dark matter particles in this model, thus can advance our knowledge of dark matter. |
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| Keywords: | stars: neutron cosmology: dark matter Weakly Interacting Massive Particle (WIMP) WIMP-neutron cross-section |
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