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The effects of superhigh magnetic fields on the equations of state of neutron stars
Author(s) -
Gao Z. F.,
Wang N.,
XU Y.,
Shan H.,
Li X.D.
Publication year - 2015
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.201512239
Subject(s) - physics , magnetar , neutron star , magnetic field , landau quantization , electron , equation of state , degenerate energy levels , quantum electrodynamics , pulsar , quantization (signal processing) , astrophysics , quantum mechanics , computer science , computer vision
By introducing Dirac's δ‐function in superhigh magnetic fields, we deduce a general formula for the pressure of degenerate and relativistic electrons, P e , 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, modifications and improvements of our theory should be considered in our future studies. (© 2015 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)