Anisotropic neutron stars and perfect fluid’s energy conditions

It is reported (Estevez-Delgado and Estevez-Delgado in Eur Phys J C 78:673, 2018) recently, that the absence of anisotropic in compact object pressure leads to a solution which is not physically acceptable due to the energy density and speed of sound can not be positive at the origin at the same tim...

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Bibliographic Details
Published in:The European physical journal. C, Particles and fields Particles and fields, 2019-09, Vol.79 (9), p.1-8, Article 755
Main Authors: Setiawan, A. M., Sulaksono, A.
Format: Article
Language:English
Subjects:
Acceptable noise levels
Analysis
Anisotropy
Astronomy
Astrophysics and Cosmology
Elementary Particles
Flux density
Hadrons
Heavy Ions
Hyperons
Measurement Science and Instrumentation
Neutron stars
Neutrons
Nuclear Energy
Nuclear Physics
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
Regular Article - Theoretical Physics
String Theory
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Summary:It is reported (Estevez-Delgado and Estevez-Delgado in Eur Phys J C 78:673, 2018) recently, that the absence of anisotropic in compact object pressure leads to a solution which is not physically acceptable due to the energy density and speed of sound can not be positive at the origin at the same time. Here, we calculate the pressure and energy density of NSs using realistic EOS predicted by a relativistic mean-field model including hyperons for isotropic and three different anisotropic pressure models such as the one of Doneva and Yazadjiev (Phys Rev D 85:124023, 2012), the one of Herrera and Barreto (Phys Rev D 88:084022, 2013), and the one of Bowers and Liang (Astrophys J 188:657, 1974). We obtain that the all of energy conditions of perfect fluid are satisfied not only by anisotropic NSs profiles but also the one of isotropic NSs.
ISSN:1434-6044
1434-6052
DOI:10.1140/epjc/s10052-019-7265-7