Anisotropic pressure and hyperons in neutron stars

Abstract

We study the effects of anisotropic pressure on properties of the neutron stars with hyperons inside its core within the framework of extended relativistic mean field. It is found that the main effects of anisotropic pressure on neutron star matter is to increase the stiffness of the equation of state, which compensates for the softening of the EOS due to the hyperons. The maximum mass and redshift predictions of anisotropic neutron star with hyperonic core are quite compatible with the result of recent observational constraints if we use the parameter of anisotropic pressure model $h\le 0.8$[1] and $\Lambda \le -1.15$ [2]. The radius of the corresponding neutron star at $M$=1.4 $M_{\odot }$ is more than 13 km, while the effect of anisotropic pressure on the minimum mass of neutron star is insignificant. Furthermore, due to the anisotropic pressure in the neutron star, the maximum mass limit of higher than 2.1 $M_{\odot }$ cannot rule out the presence of hyperons in the neutron star core.

arXiv commentInt. J. Mod. Phys. E (accepted)

References in corpus (61)

• Shapiro delay measurement of a two solar mass neutron star
• A Massive Pulsar in a Compact Relativistic Binary
• The Nuclear Equation of State and Neutron Star Masses
• The Equation of State from Observed Masses and Radii of Neutron Stars
• Explosions of O-Ne-Mg Cores, the Crab Supernova, and Subluminous Type II-P Supernovae
• Anisotropic Stars in General Relativity
• The Neutron Star Mass-Radius Relation and the Equation of State of Dense Matter
• Astrophysical Measurement of the Equation of State of Neutron Star Matter
• Gravitationally redshifted absorption lines in the X-ray burst spectra of a neutron star
• Gravastars must have anisotropic pressures
• A Chiral Effective Lagrangian for Nuclei
• Hyperons and massive neutron stars: vector repulsion and SU(3) symmetry
• Relativistic effective interaction for nuclei, giant resonances, and neutron stars
• The Neutron Star Mass Distribution
• Equation of State of a Dense and Magnetized Fermion System
• Evidence for a Massive Neutron Star from a Radial-Velocity Study of the Companion to the Black Widow Pulsar PSR B1957+20
• Electrically charged compact stars and formation of charged black holes
• General relativistic polytropes for anisotropic matter: The general formalism and applications
• Electric fields at the quark surface of strange stars in the color-flavor locked phase
• Properties of Strange Hadronic Matter in Bulk and in Finite Systems
• Measurement of the Radius of Neutron Stars with High S/N Quiescent Low-mass X-ray Binaries in Globular Clusters
• Maximum mass of neutron stars and strange neutron-star cores
• Neutron star stiff equation of state derived from cooling phases of the X-ray burster 4U 1724-307
• Hyperons in neutron-star cores and two-solar-mass pulsar
• Observational constraints on hyperons in neutron stars
• Analysis of Chiral Mean-Field Models for Nuclei
• Non-radial oscillations of anisotropic neutron stars in the Cowling approximation
• Estimation of the effect of hyperonic three-body forces on the maximum mass of neutron stars
• Radial pulsations and stability of anisotropic stars with quasi-local equation of state
• Gravastar Solutions with Continuous Pressures and Equation of State
• The Nearest Millisecond Pulsar Revisited with XMM-Newton: Improved Mass-Radius Constraints for PSR J0437-4715
• PSR J1311-3430: A Heavyweight Neutron Star with a Flyweight Helium Companion
• Newtonian polytropes for anisotropic matter: General framework and applications
• Equation of state of hypernuclear matter: impact of hyperon--scalar-meson couplings
• The Double Pulsar J0737--3039: Testing the Neutron Star Equation of State
• The importance of anisotropy for relativistic fluids with spherical symmetry
• A new equation of state for neutron star matter with nuclei in the crust and hyperons in the core
• Hyperon stars at finite temperature in the Brueckner theory
• Anisotropic relativistic stellar models
• Neutron star equilibrium configurations within a fully relativistic theory with strong, weak, electromagnetic, and gravitational interactions
• Hybrid stars in the light of the massive pulsar PSR J1614-2230
• Polytropic spheres with electric charge: compact stars, the Oppenheimer-Volkoff and Buchdahl limits, and quasiblack holes
• On the Maximum Mass of Neutron Stars
• On charged boson stars
• Large-mass neutron stars with hyperonization
• Optimization of relativistic mean field model for finite nuclei to neutron star matter
• Existence of hyperons in the pulsar PSRJ1614-2230
• Constraints on the Mass and Radius of the Neutron Star XTE J1807-294
• Two-fluid dark matter models
• Uniformly rotating neutron stars in the global and local charge neutrality cases
• Anisotropic Models for Globular Clusters, Galactic Bulges and Dark Halos
• Local conditions separating expansion from collapse in spherically symmetric models with anisotropic pressures
• Deformation of a magnetized neutron star
• Properties of Bare Strange Stars Associated with Surface Electric Fields
• Boson stars with repulsive selfinteractions
• Equilibrium of Spheres with Local Anisotropy in Postnewtonian Gravity. Application to White Dwarfs
• Surface tension of the core-crust interface of neutron stars with global charge neutrality
• Nuclei embedded in an electron gas
• Interaction induced deformation in momentum distribution of spin polarized nuclear matter
• Hyperon and nuclear symmetry energy in the neutron star
• Strong electric fields induced on a sharp stellar boundary

Cited by in corpus (10)

• Gravitational waves from neutron star mergers and their relation to the nuclear equation of state
• $I-$Love$-C$ relation for an anisotropic neutron star
• Rotating neutron stars with quark cores
• Modelling anisotropic fluid spheres in general relativity
• Hyperons in neutron stars within Eddington-inspired Born-Infeld theory of gravity
• Effects of hadron-quark phase transition on properties of Neutron Stars
• Relativistic stellar modeling with perfect fluid core and anisotropic envelope fluid
• Constraining the Surface Curvature of an Anisotropic Neutron Star
• Rotational mass of anisotropic neutron stars within Rastall gravity
• Anisotropic pressure effect on central EOS of PSR J0740+6620 in the light of dimensionless TOV equation