Secondary component of gravitational-wave signal GW190814 as an anisotropic neutron star

被引：48
作者：
Roupas, Zacharias [1 ]
机构：
[1] British Univ Egypt, Ctr Theoret Phys, Cairo 11837, Egypt
来源：
ASTROPHYSICS AND SPACE SCIENCE | 2021年 / 366卷 / 01期
关键词：
Gravitational waves; Neutron stars; EQUATION-OF-STATE; MASS-DISTRIBUTION; COMPACT STARS; FLUID SPHERES; MAXIMUM MASS; SUPERFLUIDITY; NUCLEAR; FIELD; F(R; CRYSTALLIZATION;
D O I：
10.1007/s10509-021-03919-5
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The gravitational-wave signal GW190814 involves a compact object with mass (2.50-2.67)M circle dot within the so-called low mass gap. As yet, a general consensus on its nature, being a black hole, a neutron star or an exotic star, has not been achieved. We investigate the possibility this compact object to be an anisotropic neutron star. Anisotropies in a neutron star core arise naturally by effects such as superfluidity, hyperons, strong magnetic fields and allow the maximum mass to exceed that of the ideally isotropic stars. We consider the Krori-Barua ansatz to model an anisotropic core and constrain the equation of state with LIGO/Virgo observations GW170817 and GW190814. We find that the GW190814 secondary component can be an anisotropic neutron star compatible with LIGO/Virgo constraints if the radius attains a value in the range (13.2-14.0)km with the anisotropic core's boundary density in the range (3.5-4.0).1014 g/cm(3).
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页数：5
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共 86 条
  • [41] Ilyas M, 2017, ASTROPHYS SPACE SCI, V362, DOI 10.1007/s10509-017-3215-8
  • [42] Analytical study of anisotropic compact star models
    Ivanov, B. V.
    [J]. EUROPEAN PHYSICAL JOURNAL C, 2017, 77 (11):
  • [43] Maximum bounds on the surface redshift of anisotropic stars
    Ivanov, BV
    [J]. PHYSICAL REVIEW D, 2002, 65 (10):
  • [44] Ivanov BV., 2002, Phys. Rev. D, V65, p104001
  • [45] Jedamzik K, 2020, ARXIV200703565
  • [46] Central density dependent anisotropic compact stars
    Kalam, Mehedi
    Rahaman, Farook
    Hossein, Sk Monowar
    Ray, Saibal
    [J]. EUROPEAN PHYSICAL JOURNAL C, 2013, 73 (04): : 1 - 6
  • [47] THE NEUTRON STAR MASS DISTRIBUTION
    Kiziltan, Buelent
    Kottas, Athanasios
    De Yoreo, Maria
    Thorsett, Stephen E.
    [J]. ASTROPHYSICAL JOURNAL, 2013, 778 (01)
  • [48] ENERGY CONDITIONS FOR AN IMPERFECT FLUID
    KOLASSIS, CA
    SANTOS, NO
    TSOUBELIS, D
    [J]. CLASSICAL AND QUANTUM GRAVITY, 1988, 5 (10) : 1329 - 1338
  • [49] SINGULARITY-FREE SOLUTION FOR A CHARGED FLUID SPHERE IN GENERAL RELATIVITY
    KRORI, KD
    BARUA, J
    [J]. JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL, 1975, 8 (04): : 508 - 511
  • [50] Lehmann B. V., 2020, ARXIV200700021
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