Magnetic susceptibility and magnetization properties of asymmetric nuclear matter in a strong magnetic field

Abstract

We study the effects of a strong magnetic field on the proton and neutron spin polarization and magnetic susceptibility of asymmetric nuclear matter within a relativistic mean-field approach. It is shown that magnetic fields B ∼ 10 16 -10 17 G have noticeable effects on the range of densities of interest for the study of the crust of a neutron star. Although the proton susceptibility is larger for weaker fields, the neutron susceptibility becomes of the same order or even larger for small proton fractions and subsaturation densities for B > 10 16 G. We expect that neutron superfluidity in the crust will be affected by the presence of magnetic fields.

Magnetized Rotational Neutron Stars and Mass-radius Relation

“…We use the Lagrangian given in Ref. [8][9][10][11][12][14][15][16] . This Lagrangian includes the baryon octet {p, n, Λ, Σ 0 , Σ ± , Ξ 0 , Ξ − }, electron, and muon are taken into account among fermions.…”

Impact of strong magnetic fields on the inner crust of neutron stars

“…As a result, the so-called nuclear pasta phases are expected to appear in the inner crust of neutron stars [6][7][8][9], which play a significant role in interpreting a lot of astrophysical observations, such as the giant flares and quasiperiodic oscillations from soft γ-ray repeaters, and glitches in the spin rate of pulsars [10][11][12][13][14][15]. The soft γray repeaters and anomalous x-ray pulsars have already been confirmed as magnetars with very strong surface magnetic fields [16,17], which can be as high as 10 14 -10 15 G [18,19]. The magnetic field strength in the core of a neutron star may even reach 10 18 G [20, 21].…”

“…In past decades, great efforts have been devoted to study the effects of strong magnetic fields on the properties of asymmetry nuclear matter and neutron star structures, and the homogeneous stellar matter under strong magnetic fields has also been extensively studied [18,[24][25][26][27][28]. The effects of Landau quantization can reduce the electron chemical potential and increase the proton fraction, which leads to the softening of equation of state for neutron stars.…”

Hadronic matter under an external magnetic field: In-medium modification of the pion mass

“…It has been used to study the structure of neutron stars and particularly to analyze hadronic matter in the presence of an external magnetic field [3,4,6,7,14,15,16]. The versatility of this formulation allows the inclusion of the intrinsic magnetic moments in a covariant way.…”