Modified pressure of relativistic electrons in a superhigh magnetic field
文献类型：期刊论文
| 作者 | Dong, Ai-Jun1,3,4; Gao, Zhi-Fu3 ; Yang, Xiao-Feng3; Wang, Na3; Liu, Chang4; Peng, Qiu-He2
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| 刊名 | ACTA PHYSICA SINICA
 |
| 出版日期 | 2023-02-05 |
| 卷号 | 72期号:3页码:16 |
| ISSN号 | 1000-3290 |
| 关键词 | superhigh magnetic field Landau level magnetars magnetization |
| DOI | 10.7498/aps.72.20220092 |
| 通讯作者 | Gao, Zhi-Fu(zhifugao@xao.ac.cn) |
| 英文摘要 | Magnetar is a kind of pulsar powered by magnetic field energy. The study of magnetars is an important hotspot in the field of pulsars. In this paper, according to the work of Zhu Cui, et al. (Zhu C, Gao Z F, Li X D, Wang N, Yuan J P, Peng Q H 2016 Mod. Phys. Lett. A 31 1650070), we reinvestigate the Landau-level stability of electrons in a superhigh magnetic field (SMF), B >> B-cr (B-cr is a quantum critical magnetic field with a value of 4.414x10(13) G), and its influence on the pressure of electrons in magnetar. First, we briefly review the pressure of electrons in neutron star (NS) with a weak-magnetic field limit (B << B-cr). Then, we introduce an electron Landau level stability coefficient g(v) and a Dirac-delta function to deduce a modified pressure formula for the degenerate and relativistic electrons in an SMF in an application range of matter density rho >= 10(7) g.cm(-3) and B-cr << B < 10(17) G. By modifying the phase space of relativistic electrons, the SMF can enhance the electron number density n(e), and reduce the maximum of electron Landau level number v(max), which results in a redistribution of electrons. As B increases, more and more electrons will occupy higher Landau levels, and the electron Landau level stability coefficient g(v) will decrease with the augment of Landau energy-level number v. By modifying the phase space of relativistic electrons, the electron number density n(e) increases with the MF strength increasing, leading the electron pressure Pe to increase. Utilizing the modified expression of electron pressure, we discuss the phenomena of Fermion spin polarization and electron magnetization in the SMF, and the modification of the equation of state by the SMF. We calculate the baryon number density, magnetization pressure, and the difference between pressures in the direction parallel to and perpendicular to the magnetic field in the frame of the relativistic mean field model. Moreover, we find that the pressure anisotropy due to the strong magnetic field is very small and can be ignored in the present model. We compare our results with the results from other similar studies, and examine their similarities and dissimilarities. The similarities include 1) the abnormal magnetic moments of electrons and the interaction between them are ignored; 2) the electron pressure relate to magnetic field intensity B, electron number density n(e) and electron Fermi energy E-F(e), and the latter two are complex functions containing B; 3) with n(e) and E-F(e) fixed, P-e increases with B rising; 4) as B increases, the pressure-density curves fitted by the results from other similar studies have irregular protrusions or fluctuations, which are caused by the transformation of electron energy state from partial filling to complete filling at the v-level or the transition of electrons from the v to the (v+1)-level. This phenomenon is believed to relate to the behavior of electrons near the Fermi surface in a strong magnetic field, which essentially reflects the Landau level instability. Finally, the future research direction is prospected. The present results provide a reference for future studies of the equation of state and emission mechanism of high-B pulsar, magnetar and strongly magnetized white dwarf. |
| WOS关键词 | EQUATIONS ; STATE ; MASS |
| 资助项目 | National Natural Science Foundation of China[12041304] ; National Natural Science Foundation of China[U1831120] ; Natural Science Foundation of Xinjiang Uygur Autonomous Region, China[2022D01A155] ; Natural Science Foundation of Guizhou, China[[2019] 1241] ; Natural Science Foundation of Guizhou, China[(2020) 003] ; High Level Talent Program support project of Chinese Academy of Sciences, China[[2019] 085] |
| WOS研究方向 | Physics |
| 语种 | 英语 |
| 出版者 | CHINESE PHYSICAL SOC |
| WOS记录号 | WOS:001008598400017 |
| 资助机构 | National Natural Science Foundation of China ; Natural Science Foundation of Xinjiang Uygur Autonomous Region, China ; Natural Science Foundation of Guizhou, China ; High Level Talent Program support project of Chinese Academy of Sciences, China |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/5271]  |
| 专题 | 研究单元未命名 |
| 通讯作者 | Gao, Zhi-Fu |
| 作者单位 | 1.Guizhou Prov Key Lab Radio Data Proc, Guiyang 550001, Peoples R China 2.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210000, Peoples R China 3.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China 4.Guizhou Normal Univ, Sch Phys & Elect Sci, Guiyang 550001, Peoples R China |
| 推荐引用方式 GB/T 7714 | Dong, Ai-Jun,Gao, Zhi-Fu,Yang, Xiao-Feng,et al. Modified pressure of relativistic electrons in a superhigh magnetic field[J]. ACTA PHYSICA SINICA,2023,72(3):16. |
| APA | Dong, Ai-Jun,Gao, Zhi-Fu,Yang, Xiao-Feng,Wang, Na,Liu, Chang,&Peng, Qiu-He.(2023).Modified pressure of relativistic electrons in a superhigh magnetic field.ACTA PHYSICA SINICA,72(3),16. |
| MLA | Dong, Ai-Jun,et al."Modified pressure of relativistic electrons in a superhigh magnetic field".ACTA PHYSICA SINICA 72.3(2023):16. |
入库方式： OAI收割
来源：新疆天文台
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