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Anisotropic pressure and hyperons in neutron stars
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Anisotropic pressure and hyperons in neutron stars
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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.
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Cited by 1 Pith paper
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Mass--radius relations, surface redshift, and echo time of neutron-star--wormhole system with chaotic magnetic field and anisotropic matter
Anisotropic magnetized neutron-star–wormhole models predict ultracompact objects with masses above 8 solar masses, surface redshifts above 1.5, and echo times of order 10^-2–10^-1 ms.
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