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Chin. Phys. B, 2014, Vol. 23(8): 089501    DOI: 10.1088/1674-1056/23/8/089501
GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS Prev  

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

Wen De-Hua, Liu He-Lei, Zhang Xiang-Dong
School of Sciences, South China University of Technology, Guangzhou 510641, China
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 BD=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.
Keywords:  strongly magnetize field      white dwarf      general relativity effect  
Received:  16 December 2013      Revised:  17 February 2014      Published:  15 August 2014
PACS:  95.30.Sf (Relativity and gravitation)  
  51.30.+i (Thermodynamic properties, equations of state)  
  71.70.Di (Landau levels)  
  04.40.Dg (Relativistic stars: structure, stability, and oscillations)  
Fund: 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.
Corresponding Authors:  Wen De-Hua     E-mail:  wendehua@scut.edu.cn

Cite this article: 

Wen De-Hua, Liu He-Lei, Zhang Xiang-Dong The mass limit of white dwarfs with strong magnetic fields in general relativity 2014 Chin. Phys. B 23 089501

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