Inhibition of degeneracy by intense magnetic fields: derivation and astrophysical application

• Published in: Astrophysics and space science Vol. 135; no. 1; pp. 87 - 104
• Main Authors: INGRAHAM, R. L, WILKES, J. M
• Format: Journal Article
• Language: English
• Published: Dordrecht Kluwer 01.07.1987
• Subjects: Astronomy; Earth, ocean, space; Exact sciences and technology; Fundamental aspects of astrophysics; Fundamental astronomy and astrophysics. Instrumentation, techniques, and astronomical observations; Magnetohydrodynamics and plasmas; Plasma; Magnetohydrodynamics; Fermion system; Astrophysics; Magnetic field
• ISSN: 0004-640X; 1572-946X
• DOI: 10.1007/BF00644464

Strong magnetic fields inhibit degeneracy in Fermi gases, that is, they postpone degeneracy to higher densities or lower temperatures. This principle, virtually unknown in the physical and astrophysical literature, is derived for the case of an ideal Dirac electron gas. Its possible importance in astrophysics is due to the fact that the equations of state of Fermi gases at given density and temperature can be qualitatively changed by this degeneracy-inhibition by strong fields. All astrophysical work with strong fields up to the present has used the field-free equations of state and the usual MHD approximation: permeability of about 1. An application to hypothetical degenerate stellar objects with arbitrarily strong fields is considered in order to see what effects the changed equations of state would lead to. One result is that the luminosity-temperature relation of the star is changed: the luminosity is reduced for given mass and interior temperature. (Author)