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.

Int. J. Mod. Phys. E (accepted)

References in corpus (13)

• Shapiro delay measurement of a two solar mass neutron star
• A Massive Pulsar in a Compact Relativistic Binary
• Astrophysical Measurement of the Equation of State of Neutron Star Matter
• Relativistic effective interaction for nuclei, giant resonances, and neutron stars
• Equation of State of a Dense and Magnetized Fermion System
• 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
• Neutron star equilibrium configurations within a fully relativistic theory with strong, weak, electromagnetic, and gravitational interactions
• Large-mass neutron stars with hyperonization
• Two-fluid dark matter models
• Properties of Bare Strange Stars Associated with Surface Electric Fields
• Nuclei embedded in an electron gas

Cited by in corpus (2)

• $I-$Love$-C$ relation for an anisotropic neutron star
• Anisotropic pressure effect on central EOS of PSR J0740+6620 in the light of dimensionless TOV equation