Quark stars under strong magnetic fields

Abstract

Within the confined isospin- and density-dependent mass model, we study the properties of strange quark matter (SQM) and quark stars (QSs) under strong magnetic fields. The equation of state of SQM under a constant magnetic field is obtained self-consistently and the pressure perpendicular to the magnetic field is shown to be larger than that parallel to the magnetic field, implying that the properties of magnetized QSs generally depend on both the strength and the orientation of the magnetic fields distributed inside the stars. Using a density-dependent magnetic field profile which is introduced to mimic the magnetic field strength distribution in a star, we study the properties of static spherical QSs by assuming two extreme cases for the magnetic field orientation in the stars, i.e., the radial orientation in which the local magnetic fields are along the radial direction and the transverse orientation in which the local magnetic fields are randomly oriented but perpendicular to the radial direction. Our results indicate that including the magnetic fields with radial (transverse) orientation can significantly decrease (increase) the maximum mass of QSs, demonstrating the importance of the magnetic field orientation inside the magnetized compact stars.

9 pages, 4 figures. Discussions added. Accepted version to appear in PRD

References in corpus (11)

• A Massive Pulsar in a Compact Relativistic Binary
• Color superconductivity in dense quark matter
• Cold Quark Matter
• Equation of State of a Dense and Magnetized Fermion System
• Quark matter under strong magnetic fields in the Nambu--Jona-Lasinio Model
• Phase diagram and critical endpoint for strongly-interacting quarks
• Deconfinement phase transition in hybrid neutron stars from the Brueckner theory with three-body forces and a quark model with chiral mass scaling
• Testing Deconfinement at High Isospin Density
• Magnetic Phases in Three-Flavor Color Superconductivity
• Magnetized strange quark matter in a quasiparticle description
• Stable configurations of hybrid stars with colour-flavour-locked core

Cited by in corpus (6)

• Quark magnetar in three-flavor Nambu--Jona-Lasinio model with vector interaction and magnetized gluon potential
• Stability of magnetized strange quark matter in the MIT bag model with the density dependent bag pressure
• General relativistic polytropes in anisotropic stars
• Anisotropic magnetized white dwarfs: Unifying under- and over-luminous peculiar and standard type Ia supernovae
• Warm asymmetric quark matter and proto-quark stars within the confined-isospin-density-dependent mass model
• Landau quantization and spin polarization of cold magnetized quark matter