Towards understanding astrophysical effects of nuclear symmetry energy

Li, Bao-An; Krastev, Plamen G.; Wang, Dehua; Zhang, Naibo

doi:10.1140/epja/i2019-12780-8

Cited by 215 publications

(178 citation statements)

References 619 publications

(1,186 reference statements)

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“…Its strong gravity may constraint or modify the equation of general relativity (GR) (Psaltis 2008;. To explore the observables of the NS is quite tricky due to its uncertainty in the equation of state (EoS) at supra saturation density, mainly the symmetry energy (Tsang et al 2009;Xu et al 2010;Horowitz et al 2014;Danielewicz & Lee 2014;Baldo & Burgio 2016;Li et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Effects of dark matter on the nuclear and neutron star matter

Das

Kumar

et al. 2020

Monthly Notices of the Royal Astronomical Society

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We study the dark matter (DM) effects on the nuclear matter (NM) parameters characterizing the equation of states of super dense neutron-rich nucleonic matter. The observables of the NM, i.e. incompressibility, symmetry energy and its higher order derivatives in the presence DM for symmetric and asymmetric NM are analysed with the help of an extended relativistic mean field model. The calculations are also extended to β-stable matter to explore the properties of the neutron star (NS). We analyse the DM effects on symmetric NM, pure neutron matter, and NS using NL3, G3, and IOPB-I forces. The binding energy per particle and pressure is calculated with and without considering the DM interaction with the NM systems. The influences of DM are also analysed on the symmetry energy and its different coefficients. The incompressibility and the skewness parameters are affected considerably due to the presence of DM in the NM medium. We extend the calculations to the NS and find its mass, radius and the moment of inertia for static and rotating NS with and without DM contribution. The mass of the rotating NS is considerably changing due to rapid rotation with the frequency in the mass-shedding limit. The effects of DM are found to be important for some of the NM parameters, which are crucial for the properties of astrophysical objects.

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Section: Introductionmentioning

confidence: 99%

Effects of dark matter on the nuclear and neutron star matter

Das

Kumar

et al. 2020

Monthly Notices of the Royal Astronomical Society

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“…Even though significant progress in constraining EOS of NSs from maximum masses and radii that extracted from NS property observations have been made up to now, the EOS of NSs, especially in the inner core is still unknown properly (please see Refs. [16,17] for a recent review and the references therein.). It is also reported that the gravitation wave (GW) signal emitted by compact binary objects will take a vital role in the future for understanding NSs properties [18].…”

Section: Introductionmentioning

confidence: 99%

Anisotropic neutron stars and perfect fluid’s energy conditions

Setiawan

Sulaksono

2019

Eur. Phys. J. C

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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 (

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“…n 0 refers to the saturation densities. In nuclear density functional theories, it was found that the slope of symmetry energy at saturation density has strong linear correlations with the neutron skins of 208 Pb and the symmetry energy [10,11]. In Fig.…”

Section: The Relativistic Brueckner-hartree-fock Model In Nu-cleamentioning

confidence: 91%

Properties of nuclear matter in relativistic Brueckner–Hartree–Fock model with high-precision charge-dependent potentials

Wang

Zhang

et al. 2020

J. Phys. G: Nucl. Part. Phys.

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Properties of nuclear matter are investigated in the framework of relativistic Brueckner-Hartree-Fock model with the latest high-precision charge-dependent Bonn (pvCD-Bonn) potentials, where the coupling between pion and nucleon is adopted as pseudovector form. These realistic pvCD-Bonn potentials are renormalized to effective nucleon-nucleon (N N) interactions, G matrices. They are obtained by solving the Blankenbecler-Sugar (BbS) equation in nuclear medium. Then, the saturation properties of symmetric nuclear matter are calculated with pvCD-Bonn A, B, C potentials. The energies per nucleon are around −10.72 MeV to −16.83 MeV at saturation densities, 0.139 fm −3 to 0.192 fm −3 with these three potentials, respectively. It clearly demonstrates that the pseudovector coupling between pion and nucleon can generate reasonable saturation properties comparing with pseudoscalar coupling. Furthermore, these saturation properties have strong correlations with the tensor components of N N potentials, i.e., the D-state probabilities of deuteron, P D to form a relativistic Coester band. The equations of state of pure neutron matter from pvCD-Bonn potentials are almost identical, since the prominent difference of pvCD Bonn potentials are the components of tensor force, which provides very weak contributions in the case of total isospin T = 1. In addition, the charge symmetry breaking (CSB) and charge independence breaking (CIB) effects are also discussed in nuclear matter from the partial wave contributions with these highprecision charge-dependent potentials. In general, the magnitudes of CSB from the differences between nn and pp potentials are about 0.05 MeV, while those of CIB are around 0.35 MeV from the differences between np and pp potentials. Finally, the equations of state of asymmetric nuclear matter are also calculated with different asymmetry parameters. It is found that the effective neutron mass is larger than the proton one in neutron-rich matter.

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Towards understanding astrophysical effects of nuclear symmetry energy

Cited by 215 publications

References 619 publications

Effects of dark matter on the nuclear and neutron star matter

Effects of dark matter on the nuclear and neutron star matter

Anisotropic neutron stars and perfect fluid’s energy conditions

Properties of nuclear matter in relativistic Brueckner–Hartree–Fock model with high-precision charge-dependent potentials

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