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This study analyzes and contrasts different phenomenological methods used to model the nuclear equation of state (EOS) for neutron star matter based on covariant energy density functionals (CEDF). Using two complementary methodologies, we…

The composition and properties of infinite nuclear matter under extreme conditions of temperature and pressure remain incompletely understood. In this work, we constrain the equation of state (EoS) of nuclear matter - constructed within the…

核理论 · 物理学 2025-11-04 Rahul Kumar , Prasanta Char , Rana Nandi

Models of neutron stars (NSs) with hyperon cores are constructed with an effective chiral model in mean-field approximation. The hyperon couplings are fixed by reproducing their experimentally determined binding energies. The impact of…

核理论 · 物理学 2019-01-31 Debashree Sen , Kinjal Banerjee , T. K. Jha

Taking into account the terrestrial experiments and the recent astrophysical observations of neutron stars and gravitational-wave signals, we impose restrictions on the equation of state (EoS) for isospin-asymmetric nuclear matter. Using…

核理论 · 物理学 2021-03-18 Soonchul Choi , Tsuyoshi Miyatsu , Myung-Ki Cheoun , Koichi Saito

The proper understanding of the equation of state (EoS) of highly asymmetric nuclear matter is essential when studying systems such as neutron stars (NSs). Using zero-range Skyrme interactions and finite-range interactions such as Gogny…

核理论 · 物理学 2020-03-03 Claudia Gonzalez-Boquera

An equation of state(EOS) of nuclear matter with explicit inclusion of a spin-isospin dependent force is constructed from a finite range, momentum and density dependent effective interaction. This EOS is found to be in good agreement with…

核理论 · 物理学 2009-10-30 V. S. Uma Maheswari , D. N. Basu , J. N. De , S. K. Samaddar

We use the effective relativistic mean-field (E-RMF) model to study the crustal properties of the neutron star. The unified equations of state (EoS) are constructed using recently developed E-RMF parameter sets, such as FSUGarnet, IOPB-I,…

核理论 · 物理学 2022-02-24 Vishal Parmar , H. C. Das , Ankit Kumar , M. K. Sharma , S. K. Patra

We adopt two- and three-body nuclear forces derived at the next-to-next-to-leading-order (N2LO) in the framework of effective chiral perturbation theory (ChPT) to calculate the equation of state (EOS) of $\beta$-stable neutron star matter…

高能天体物理现象 · 物理学 2018-06-27 Domenico Logoteta , Ignazio Bombaci

We have attempted to mitigate the challenge of connecting the neutron star (NS) properties with the nuclear matter parameters that describe equations of state (EoSs). The efforts to correlate various neutron star properties with individual…

核理论 · 物理学 2023-12-13 N. K. Patra , Prafulla Saxena , B. K. Agrawal , T. K. Jha

We apply a novel equation of state (EoS) that includes the surface tension contribution induced by interparticle interaction and asymmetry between neutrons and protons, to the study of neutron star (NS) properties. This elaborated EoS is…

高能天体物理现象 · 物理学 2019-02-11 Violetta V. Sagun , Ilidio Lopes , Aleksei I. Ivanytskyi

We construct the equation of state (EOS) in a wide density range for neutron stars using the relativistic mean field theory. The properties of neutron star matter with both uniform and non-uniform distributions are studied consistently. The…

核理论 · 物理学 2009-11-07 H. Shen

A set of hadronic equations of state (EoSs) derived from relativistic density functional theory and constrained by terrestrial experiments, astrophysical observations, in particular by the GW170817 event, and chiral effective field theory…

高能天体物理现象 · 物理学 2019-07-31 Jia Jie Li , Armen Sedrakian

We calculate the equation of state (EoS) of dense matter, using a relativistic mean field (RMF) model with a density dependent coupling that is a slightly modified form of the original NL3 interaction. For nonuniform nuclear matter we…

核理论 · 物理学 2015-03-13 G. Shen , C. J. Horowitz , S. Teige

We have conducted an extensive study using a diverse set of equations of state (EoSs) to uncover strong relationships between neutron star (NS) observables and the underlying EoS parameters using symbolic regression method. These EoS…

The difficulty in describing the equation of state (EoS) for nuclear matter at densities above the saturation density ($\rho_0$) has led to the emergence of a multitude of models based on different assumptions and techniques. These EoSs,…

核理论 · 物理学 2024-01-17 Ameya Thete , Kinjal Banerjee , Tuhin Malik

The uncertainties in neutron star (NS) radii and crust properties due to our limited knowledge of the equation of state (EOS) are quantitatively analysed. We first demonstrate the importance of a unified microscopic description for the…

太阳与恒星天体物理 · 物理学 2016-10-12 M. Fortin , C. Providencia , A. R. Raduta , F. Gulminelli , J. L Zdunik , P. Haensel , M. Bejger

In the framework of Thomas-Fermi approximation, we study systematically the EOSs and microscopic structures of neutron star matter in a vast density range with $n_\mathrm{b}\approx 10^{-10}$-2 $\mathrm{fm}^{-3}$, where various covariant…

核理论 · 物理学 2022-08-30 Cheng-Jun Xia , Toshiki Maruyama , Ang Li , Bao Yuan Sun , Wen-Hui Long , Ying-Xun Zhang

In this study, my main goal is to examine the nuclear matter properties across a wide range of conditions, such as temperature, density, asymmetry, pressure, and magnetic field. Understanding the effect of these factors on nuclear matter is…

核理论 · 物理学 2023-09-21 Vishal Parmar

The current observational properties of neutron stars have not definitively ruled out the possibility of dark matter. In this study, we primarily focus on exploring correlations between the dark matter model parameters and different neutron…

高能物理 - 唯象学 · 物理学 2023-08-02 Prashant Thakur , Tuhin Malik , Arpan Das , T. K. Jha , Constança Providência

The impacts of various symmetry energy parameters on the properties of neutron stars (NSs) have been recently investigated, and the outcomes are at variance, as summarized in Table III of Phys. Rev. D 106, 063005 (2022). We have…

核理论 · 物理学 2023-05-19 N. K. Patra , Anagh Venneti , Sk Md Adil Imam , Arunava Mukherjee , B. K. Agrawal