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题名: Modified Fermi energy of electrons in a superhigh magnetic field
作者: Zhu, Cui1, 2, 3; Gao, Zhi Fu1, 2; Li, Xiang Dong4, 5; Wang, Na1; Yuan, Jian Ping1; Peng, Qiu He4
刊名: MODERN PHYSICS LETTERS A
出版日期: 2016-04-10
卷号: 31, 期号:11
关键词: Neutron star ; equation of state ; Fermi energy
DOI: 10.1142/S021773231650070X
文章类型: Article
英文摘要: In this paper, we investigate the electron Landau level stability and its influence on the electron Fermi energy, E-F(e), in the circumstance of magnetars, which are powered by magnetic field energy. In a magnetar, the Landau levels of degenerate and relativistic electrons are strongly quantized. A new quantity g(n), the electron Landau level stability coefficient is introduced. According to the requirement that g(n) decreases with increasing the magnetic field intensity B, the magnetic field index beta in the expression of E-F(e) must be positive. By introducing the Dirac-delta function, we deduce a general formulae for the Fermi energy of degenerate and relativistic electrons, and obtain a particular solution to E-F(e) in a superhigh magnetic field (SMF). This solution has a low magnetic field index of beta = 1/6, compared with the previous one, and works when rho >= 10(7) g cm(-3) and B-cr << B <= 10(17) Gauss. By modifying the phase space of relativistic electrons, a SMF can enhance the electron number density n(e), and decrease the maximum of electron Landau level number, which results in a redistribution of electrons. According to Pauli exclusion principle, the degenerate electrons will fill quantum states from the lowest Landau level to the highest Landau level. As B increases, more and more electrons will occupy higher Landau levels, though g(n) decreases with the Landau level number n. The enhanced n(e) in a SMF means an increase in the electron Fermi energy and an increase in the electron degeneracy pressure. The results are expected to facilitate the study ofthe weak-interaction processes inside neutron stars and the magnetic-thermal evolution mechanism for magnetars.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Physics, Nuclear ; Physics, Particles & Fields ; Physics, Mathematical
研究领域[WOS]: Physics
关键词[WOS]: NEUTRON-STARS ; NUCLEAR-MATTER ; X-RAY ; EMISSION ; STATE ; REPEATERS ; EQUATION ; PHYSICS ; DECAY
收录类别: SCI
项目资助者: Xinjiang Radio Astrophysics Laboratory(2015KL012) ; Xinjiang Natural Science Foundation(2013211A053) ; Chinese National Science Foundation(11173041 ; National Basic Research Program of China grants 973 Programs(2012CB821801 ; Chinese Academy of Sciences(XDB09000000) ; West Light Foundation of Chinese Academy of Sciences(2172201302 ; Qinglan project of Jiangsu Province ; 11173042 ; 2015CB857100) ; XBB201422) ; 11003034 ; 11273051 ; 11373006 ; 11133001)
语种: 英语
WOS记录号: WOS:000374542200006
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/16210
Appears in Collections:宇宙伽马暴、中子星及相关物理研究团组_期刊论文

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作者单位: 1.Chinese Acad Sci, Xinjiang Astron Observ, 150 Sci 1 St, Urumqi, Xinjiang, Peoples R China
2.Chinese Acad Sci, Key Lab Radio Astron, 2 West Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
3.Univ Chinese Acad Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
4.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210008, Jiangsu, Peoples R China
5.Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210008, Jiangsu, Peoples R China
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