Rotating neutron stars with chaotic magnetic fields in general relativity and Rastall gravity

Abstract

Observations indicate that the magnetic fields on neutron stars (NSs) lie in the range of $10^8$-$10^{15}$ G. We investigate rotating NSs with chaotic magnetic fields in both general relativity (GR) and Rastall gravity (RG). The equation of state (EOS) of NS matter is formulated within the framework of quantum hadrodynamics (QHD). The Hartle-Thorne formalism, extended to RG, is employed as an approximation for describing rotating NSs, while the magnetic field is modeled through an ansatz in which it is coupled to the energy density. We find that at high masses, neither rotation nor the Rastall parameter significantly affects the total mass, whereas the magnetic field strength can increase the maximum allowed mass. At lower masses, both the magnetic field and an increasing Rastall parameter reduce the stellar radius in the static configuration. Although higher angular velocities enhance stellar deformation, both magnetic field and larger Rastall parameter tend to suppress it. Regarding the moment of inertia, the Rastall parameter has little impact, whereas the magnetic field strength can increase it within the mass range $1.50$-$1.99M_{\odot }$. All parameters considered in this study are consistent with observational constraints on the moment of inertia obtained from radio observations of massive pulsars.

27 pages, 6 figures, 2 tables. v1-v7 contain some numerical errors that have been fixed in v8, accepted for publication in Int. J. Mod. Phys. D

References in corpus (18)

• A Massive Pulsar in a Compact Relativistic Binary
• GW190814: Gravitational Waves from the Coalescence of a 23 M${}_{\odot }$ Black Hole with a 2.6 M${}_{\odot }$ Compact Object
• PSR J0030+0451 Mass and Radius from NICER Data and Implications for the Properties of Neutron Star Matter
• A NICER View of PSR J0030+0451: Millisecond Pulsar Parameter Estimation
• Relativistic Mean-Field Hadronic Models under Nuclear Matter Constraints
• Einstein and Rastall Theories of Gravitation in Comparison
• Non-trivial class of anisotropic compact stellar model in Rastall gravity
• General relativistic models for rotating magnetized neutron stars in conformally flat spacetime
• Wormhole Solutions in Rastall Gravity Theory
• Gaussian black holes in Rastall Gravity
• Inflationary Attractors Predictions for Static Neutron Stars in the Mass-Gap Region
• The criteria of the anisotropic quark star models in Rastall gravity
• The internal composition of proto-neutron stars under strong magnetic fields
• Compact stars in Rastall gravity: hydrostatic equilibrium and radial pulsations
• Rotating black holes and exotic compact objects in the Kerr/CFT correspondence within Rastall gravity
• Slowly rotating anisotropic relativistic stars
• Decoding rotating neutron stars: Role of the symmetry energy slope
• Hydrostatic mass of galaxy clusters within some theories of gravity

Cited by in corpus (1)

• Effects of the symmetry energy slope on magnetized neutron stars