I - Love - C relation for an anisotropic neutron star

被引：17

作者：

Das, H. C. ^{[1
,2
]}

机构：

[1] Inst Phys, Sachivalaya Marg, Bhubaneswar 751005, India

[2] Homi Bhabha Natl Inst, Training Sch Complex, Mumbai 400094, India

来源：

PHYSICAL REVIEW D | 2022年 / 106卷 / 10期

关键词：

EQUATION-OF-STATE; ROTATING RELATIVISTIC STARS; STRONGLY MAGNETIZED NEUTRON; PSR J0030+0451; EQUILIBRIUM-MODELS; DENSE MATTER; INERTIA; MOMENT; CONSTRAINTS; MASS;

D O I：

10.1103/PhysRevD.106.103518

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

One of the most common assumptions has been made that the pressure inside the star is isotropic in nature. However, the pressure is locally anisotropic in nature which is a more realistic case. In this study, we investigate certain properties of anisotropic neutron stars with the scalar pressure anisotropy model. Different perfect fluid conditions are tested within the star with the relativistic mean-field model equation of states (EOSs). The anisotropic neutron star properties such as mass (M), radius (R), compactness (C), Love number (k(2)), dimensionless tidal deformability (Lambda), and the moment of inertia (I) are calculated. The magnitude of the quantities as mentioned above increases (decreases) with the positive (negative) value of anisotropy except k(2) and Lambda. The universal relation I - Love - C is calculated with almost 58 EOS spans from relativistic to nonrelativistic cases. We observed that the relations between them get weaker when we include anisotropicity. With the help of the GW170817 tidal deformability limit and radii constraints from different approaches, we find that the anisotropic parameter is less than 1.0 if one uses the Bowers-Liang (BL) model. Using the universal relation and the tidal deformability bound given by the GW170817, we put a theoretical limit for the canonical radius, R-1.4 = 10.74(-1.36)(+1.84) km, and the moment of inertia, I-1.4 = 1.77(-0.09)(+0.17) x 10(45) g cm(2) with 90% confidence limit for isotropic stars. Similarly, for anisotropic stars with lambda(BL) = 1.0, the values are R-1.4 = 11.74(-1.54)(+2.11) km, I-1.4 = 2.40(-0.08)(+0.17) x 10(45) g cm(2) respectively.

引用

页数：12

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