Ferromagnetic Neutron Stars in Scalar-Tensor Theories of Gravity
arXiv:1811.12090 · doi:10.1088/1475-7516/2019/03/013
Abstract
Ferromagnetic spin ordering can take place in neutron stars. This phase transition alters the neutron star equation of state. Here, applying the scalar-tensor theories of gravity, we investigate the structure of neutron stars which are in the ferromagnetic phase. Considering the equation of state of ferromagnetic neutron matter with Skyrme-type interactions at zero temperature and using the scalar-tensor theories of gravity with sufficiently negative coupling constant, we explore the spontaneous scalarization in ferromagnetic neutron stars. In this regard, the mass versus the central density, the profiles of scalar field and mass and density, the central scalar field for different central densities, and the mass-radius relation of ferromagnetic neutron stars are presented. Moreover, we investigate the influences of the coupling constant on the scalarization of ferromagnetic neutron stars. The effects of the coupling constant on the critical densities of scalarization and the scalar charge of ferromagnetic neutron stars are also calculated. In addition, we study the maximum value of the coupling constant at which the spontaneous scalarization takes place presenting the influence of the neutron matter equation of state on this critical value.
arXiv comment25 pages, 11 figures. Accepted for publication in Journal of Cosmology and Astroparticle Physics (2019)
References in corpus (26)
- Tensor-scalar gravity and binary-pulsar experiments
- The relativistic pulsar-white dwarf binary PSR J1738+0333 II. The most stringent test of scalar-tensor gravity
- Spontaneous Scalarization with Massive Fields
- Neutron stars in scalar-tensor theories of gravity and catastrophe theory
- Rapidly rotating neutron stars in scalar-tensor theories of gravity
- Slowly rotating neutron stars in scalar-tensor theories with a massive scalar field
- Stability Analysis of Spherically Symmetric Star in Scalar-Tensor Theories of Gravity
- Spherical neutron star collapse toward a black hole in tensor-scalar theory of gravity
- Neutron star transition to strong-scalar-field state in tensor scalar gravity
- On spontaneous scalarization
- Highly compact neutron stars in scalar-tensor theories of gravity: Spontaneous scalarization versus gravitational collapse
- Scalar gravitational wave from Oppenheimer-Snyder collapse in scalar- tensor theories of gravity
- Ferromagnetic instabilities in neutron matter at finite temperature with the Skyrme interaction
- Spin polarized states in strongly asymmetric nuclear matter
- Static and slowly rotating neutron stars in scalar-tensor theory with self-interacting massive scalar field
- New class of quasinormal modes of neutron stars in scalar-tensor gravity
- Ferromagnetic neutron stars: axial anomaly, dense neutron matter, and pionic wall
- Scalarization of neutron stars with realistic equations of state
- On the maximum mass limit of neutron stars in scalar-tensor gravity
- Relativistic stars in degenerate higher-order scalar-tensor theories after GW170817
- Ferromagnetism of Nuclear Matter in the Relativistic Approach
- Differentially rotating neutron stars in scalar-tensor theories of gravity
- Competition of ferromagnetic and antiferromagnetic spin ordering in nuclear matter
- Compactness of neutron stars and Tolman VII solutions in scalar-tensor gravity
- Possibility of ferromagnetic neutron matter
- Mean field at finite temperature and symmetry breaking