The mass limit of white dwarfs with strong magnetic fields in general relativity

doi:10.1088/1674-1056/23/8/089501

›› 2014, Vol. 23 ›› Issue (8): 89501-089501.doi: 10.1088/1674-1056/23/8/089501

• GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS • 上一篇

The mass limit of white dwarfs with strong magnetic fields in general relativity

文德华, 刘荷蕾, 张向东

School of Sciences, South China University of Technology, Guangzhou 510641, China

收稿日期:2013-12-16 修回日期:2014-02-17 出版日期:2014-08-15 发布日期:2014-08-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 10947023, 11275073, and 11305063) and the Fundamental Research Funds for the Central University of China (Grant Nos. 2014ZG0036 and 2013ZM107). This project was sponsored by the Science Research Foundation for Returned Overseas Chinese Scholars, SEM, and has made use of NASA's Astrophysics Data System.

The mass limit of white dwarfs with strong magnetic fields in general relativity

Wen De-Hua (文德华), Liu He-Lei (刘荷蕾), Zhang Xiang-Dong (张向东)

School of Sciences, South China University of Technology, Guangzhou 510641, China

Received:2013-12-16 Revised:2014-02-17 Online:2014-08-15 Published:2014-08-15
Contact: Wen De-Hua E-mail:wendehua@scut.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 10947023, 11275073, and 11305063) and the Fundamental Research Funds for the Central University of China (Grant Nos. 2014ZG0036 and 2013ZM107). This project was sponsored by the Science Research Foundation for Returned Overseas Chinese Scholars, SEM, and has made use of NASA's Astrophysics Data System.

摘要/Abstract

摘要： Recently, U. Das and B. Mukhopadhyay proposed that the Chandrasekhar limit of a white dwarf could reach a new high level (2.58 M_⊙) if a superstrong magnetic field were considered (Das U and Mukhopadhyay B 2013 Phys. Rev. Lett. 110 071102), where the structure of the strongly magnetized white dwarf (SMWD) is calculated in the framework of Newtonian theory (NT). As the SMWD has a far smaller size, in contrast with the usual expectation, we found that there is an obvious general relativistic effect (GRE) in the SMWD. For example, for the SMWD with a one Landau level system, the super-Chandrasekhar mass limit in general relativity (GR) is approximately 16.5% lower than that in NT. More interestingly, the maximal mass of the white dwarf will be first increased when the magnetic field strength keeps on increasing and reaches the maximal value M=2.48 M_⊙ with B_D=391.5. Then if we further increase the magnetic fields, surprisingly, the maximal mass of the white dwarf will decrease when one takes the GRE into account.

关键词: strongly magnetize field, white dwarf, general relativity effect

Abstract: Recently, U. Das and B. Mukhopadhyay proposed that the Chandrasekhar limit of a white dwarf could reach a new high level (2.58 M_⊙) if a superstrong magnetic field were considered (Das U and Mukhopadhyay B 2013 Phys. Rev. Lett. 110 071102), where the structure of the strongly magnetized white dwarf (SMWD) is calculated in the framework of Newtonian theory (NT). As the SMWD has a far smaller size, in contrast with the usual expectation, we found that there is an obvious general relativistic effect (GRE) in the SMWD. For example, for the SMWD with a one Landau level system, the super-Chandrasekhar mass limit in general relativity (GR) is approximately 16.5% lower than that in NT. More interestingly, the maximal mass of the white dwarf will be first increased when the magnetic field strength keeps on increasing and reaches the maximal value M=2.48 M_⊙ with B_D=391.5. Then if we further increase the magnetic fields, surprisingly, the maximal mass of the white dwarf will decrease when one takes the GRE into account.

Key words: strongly magnetize field, white dwarf, general relativity effect

中图分类号: (Relativity and gravitation)

95.30.Sf

51.30.+i (Thermodynamic properties, equations of state) 71.70.Di (Landau levels) 04.40.Dg (Relativistic stars: structure, stability, and oscillations)

文德华, 刘荷蕾, 张向东. The mass limit of white dwarfs with strong magnetic fields in general relativity[J]. , 2014, 23(8): 89501-089501.

Wen De-Hua (文德华), Liu He-Lei (刘荷蕾), Zhang Xiang-Dong (张向东). The mass limit of white dwarfs with strong magnetic fields in general relativity[J]. Chin. Phys. B, 2014, 23(8): 89501-089501.

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The mass limit of white dwarfs with strong magnetic fields in general relativity

The mass limit of white dwarfs with strong magnetic fields in general relativity

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