The Effects of Superhigh Magnetic Fields on Equations of States of Neutron Stars

The Effects of Superhigh Magnetic Fields on Equations of States of Neutron Stars
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超高磁场对中子星状态方程的影响

DOI:
10.1002/asna.201512239
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发表时间:
2015-08
期刊:
Astron. Nachr.
影响因子:
--
通讯作者:
X.-D. Li
X.-D. Li
中科院分区:
其他
文献类型:
--
作者:
Z.F. Gao, N. Wang, Y. Xu, H. Shan,;X.-D. Li

文献摘要

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通过介绍狄拉克?函数,导出了适用于超强磁场的简并相对论电子压强的一般公式Pe,讨论了电子朗道能级的量子化,并考虑了量子电动力学(QED)对不同物质系统状态方程的影响.主要结论如下:磁场强度越强,电子压力越高;与普通射电脉冲星相比,由于总压的各向异性,磁星可能是一种更致密的扁球状变形中子星星;由于磁场能量对星星物态方程的正贡献,磁星的最大质量可能增加。由于这是一个具有开创性的工作,可能存在一些不确定性,因此,在今后的研究中应考虑进一步修改和完善我们的理论模型。
By introducing Dirac ?-function in superhigh magnetic field, we deduce a general formula for pressure of degenerate and relativistic electrons, Pe, which is suitable for superhigh magnetic fields, discuss the quantization of Landau levels of electrons, and consider the quantum electrodynamic(QED) effects on the equations of states (EOSs) for different matter systems. The main conclusions are as follows: the stronger the magnetic field strength, the higher the electron pressure becomes; compared with a common radio pulsar, a magnetar could be a more compact oblate spheroid-like deformed neutron star due to the anisotropic total pressure; and an increase in the maximum mass of a magnetar is expected because of the positive contribution of the magnetic field energy to the EOS of the star. Since this is an original work in which some uncertainties could exist, to further modify and perfect our theory model should be considered in our future studies.
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