OLD NEUTRON STARS AS PROBES OF ISOSPIN-VIOLATING DARK MATTER
文献类型：期刊论文
| 作者 | Zheng, Hao1,2; Sun, Kai-Jia1,2; Chen, Lie-Wen1,2,3 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2015-02-20 |
| 卷号 | 800 |
| ISSN号 | 0004-637X |
| 关键词 | Astroparticle Physics Dark Matter Dense Matter Equation Of State Stars: Neutron |
| DOI | 10.1088/0004-637X/800/2/141 |
| 文献子类 | Article |
| 英文摘要 | Isospin-violating dark matter (IVDM), which couples differently with protons and neutrons, provides a promising mechanism to ameliorate the tension among recent direct detection experiments. Assuming dark matter (DM) is non-interacting bosonic asymmetric IVDM, we investigate how the existence of old neutron stars limits the DM-proton scattering cross-section sigma(p), especially the effects of the isospin-violating DM-nucleon interactions and the symmetry energy in the equation of state (EOS) of isospin asymmetric nuclear matter. Our calculations are completely based on general relativity and the structure of neutron stars is obtained by solving the Tolman-Oppenheimer-Volkoff equations with nuclear matter EOS constrained by terrestrial experiments. We find that, by considering the more realistic neutron star model rather than a simple uniform neutron sphere as usual, the sigma(p) bounds from old neutron stars can be varied by more than an order of magnitude depending on the specific values of the DM neutron-to-proton coupling ratio f(n)/f(p), and they can be further varied by more than a factor of two depending on the density dependence of the symmetry energy. In particular, we demonstrate that the observed nearby isolated old neutron star PSR B1257+12 can set a very strong limit on sigma(p) for low-mass DM particles (<= 20 GeV) that reaches a sensitivity beyond the current best limits from direct detection experiments and disfavors the DM interpretation of previously reported positive experimental results, including the IVDM. |
| WOS关键词 | EQUATION-OF-STATE ; MASSIVE PARTICLES ; NUCLEAR-MATTER ; GROUND-STATE ; CONSTRAINTS ; DENSITIES ; PARAMETRIZATION ; CAPTURE ; PHYSICS ; ORDER |
| 资助项目 | Science and Technology Commission of Shanghai Municipality[11DZ2260700] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | IOP PUBLISHING LTD |
| WOS记录号 | WOS:000349782500064 |
| 源URL | [http://119.78.100.186/handle/113462/50025]  |
| 专题 | 中国科学院近代物理研究所 |
| 通讯作者 | Zheng, Hao |
| 作者单位 | 1.Shanghai Jiao Tong Univ, Dept Phys & Astron, Shanghai 200240, Peoples R China 2.Shanghai Jiao Tong Univ, Shanghai Key Lab Particle Phys & Cosmol, Shanghai 200240, Peoples R China 3.Ctr Theoret Nucl Phys, Natl Lab Heavy Ion Accelerator, Lanzhou 730000, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zheng, Hao,Sun, Kai-Jia,Chen, Lie-Wen. OLD NEUTRON STARS AS PROBES OF ISOSPIN-VIOLATING DARK MATTER[J]. ASTROPHYSICAL JOURNAL,2015,800. |
| APA | Zheng, Hao,Sun, Kai-Jia,&Chen, Lie-Wen.(2015).OLD NEUTRON STARS AS PROBES OF ISOSPIN-VIOLATING DARK MATTER.ASTROPHYSICAL JOURNAL,800. |
| MLA | Zheng, Hao,et al."OLD NEUTRON STARS AS PROBES OF ISOSPIN-VIOLATING DARK MATTER".ASTROPHYSICAL JOURNAL 800(2015). |
入库方式： OAI收割
来源：近代物理研究所
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