Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-01-31
Astronomy and Astrophysics
Astrophysics
40 pages, 7 figures, accepted for publication in ApJ
Scientific paper
10.1086/309010
We study the effects of very strong magnetic fields on the equation of state (EOS) in multicomponent, interacting matter by developing a covariant description for the inclusion of the anomalous magnetic moments of nucleons. For the description of neutron star matter, we employ a field-theoretical approach which permits the study of several models which differ in their behavior at high density. Effects of Landau quantization in ultra-strong magnetic fields ($B>10^{14}$ Gauss) lead to a reduction in the electron chemical potential and a substantial increase in the proton fraction. We find the generic result for $B>10^{18}$ Gauss that the softening of the EOS caused by Landau quantization is overwhelmed by stiffening due to the incorporation of the anomalous magnetic moments of the nucleons. In addition, the neutrons become completely spin polarized. The inclusion of ultra-strong magnetic fields leads to a dramatic increase in the proton fraction, with consequences for the direct Urca process and neutron star cooling. The magnetization of the matter never appears to become very large, as the value of $|H/B|$ never deviates from unity by more than a few percent. Our findings have implications for the structure of neutron stars in the presence of large frozen-in magnetic fields.
Broderick Avery
Lattimer James M.
Prakash Madappa
No associations
LandOfFree
The Equation of State of Neutron-Star Matter in Strong Magnetic Fields does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Equation of State of Neutron-Star Matter in Strong Magnetic Fields, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Equation of State of Neutron-Star Matter in Strong Magnetic Fields will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-204515