Unified neutron star equations of state calibrated to nuclear properties
arXiv:2401.10842 · doi:10.1051/0004-6361/202449292
Abstract
Recently, in Malik23, a dataset of several EoS for purely nucleonic stellar matter based on a non-linear RMF model prescription, and constrained to properties of nuclear matter, to state-of-the-art chiral effective field theory calculations for low-density neutron matter, and to astrophysical data, were proposed. In this work, twenty one unified neutron star EoS were chosen from that dataset, in such a way that a large range of values of the slope of the symmetry energy at saturation is covered. Several quantities are calculated and discussed, such as the the proton fraction and the direct Urca behavior, the density dependence of the speed of sound and the trace anomaly, the crust-core transition properties, the compatibility with astrophysical observations, and the neutron matter properties from EFT calculations and pQCD constraints. We construct unified EoS, where the outer crust is given by the BSk22 functional, and the inner crust is calculated from a CLD approximation. The core is purely nucleonic, made of protons, neutrons, electrons and muons, under charge neutrality and in equilibrium conditions. The correlation of the slope of the symmetry energy at saturation with the crust-core transition density and proton fraction is analysed, and equations that translate these relations are proposed. Moreover, the spectral representation for all the EOS according to the format proposed in Lindblom10 is given, which is a convenient representation to study quasi-periodic oscillations with realistic EOS. It is shown that several of these EoS have in the center of the most massive NS a speed of sound squared of the order of . Most of the EoS predict a maximum central density of the order of about 6 times the nuclear saturation density. Three of the EoS satisfy all of the constraints imposed. All these EoS will be made available in the CompOSE platform.
14 pages, 12 figures, 7 tables
References in corpus (34)
- GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
- Multi-messenger Observations of a Binary Neutron Star Merger
- PSR J0030+0451 Mass and Radius from NICER Data and Implications for the Properties of Neutron Star Matter
- A NICER View of PSR J0030+0451: Millisecond Pulsar Parameter Estimation
- A NICER View of the Massive Pulsar PSR J0740+6620 Informed by Radio Timing and XMM-Newton Spectroscopy
- Refined Mass and Geometric Measurements of the High-Mass PSR J0740+6620
- Constraining Neutron-Star Matter with Microscopic and Macroscopic Collisions
- Neutron Stars and the Nuclear Equation of State
- Core-crust transition in neutron stars: predictivity of density developments
- On the Sound Speed in Neutron Stars
- Spectral Representations of Neutron-Star Equations of State
- How perturbative QCD constrains the Equation of State at Neutron-Star densities
- Strongly interacting matter exhibits deconfined behavior in massive neutron stars
- Trace anomaly as signature of conformality in neutron stars
- Quantifying uncertainties and correlations in the nuclear-matter equation of state
- Ab-initio QCD calculations impact the inference of the neutron-star-matter equation of state
- Influence of light nuclei on neutrino-driven supernova outflows
- Strong correlations of neutron star radii with the slopes of nuclear matter incompressibility and symmetry energy at saturation
- The Vlasov formalism for extended relativistic mean field models: the crust-core transition and the stellar matter equation of state
- Bayesian Inference of the Symmetry Energy of Super-Dense Neutron-Rich Matter from Future Radius Measurements of Massive Neutron Stars
- Nuclear symmetry energy and core-crust transition in neutron stars: a critical study
- Effects of the symmetry energy on properties of neutron star crusts near the neutron drip density
- Gravitational Wave Signal for Quark Matter with Realistic Phase Transition
- Relativistic hypernuclear compact stars with calibrated equations of state
- Perturbative QCD and the Neutron Star Equation of State
- Investigating Signatures of Phase Transitions in Neutron-Star Cores
- Spanning the full range of neutron star properties within a microscopic description
- Statistical theory of thermal evolution of neutron stars - II. Limitations on direct Urca threshold
- Bayesian inference of signatures of hyperons inside neutron stars
- Effects of nuclear symmetry energy and equation of state on neutron star properties
- Empirical constraints on the high-density equation of state from multi-messenger observables
- Constraints on high density equation of state from maximum neutron star mass
- Nonparametric model for the equations of state of neutron star from deep neural network
- Pasta phases in neutron stars under strong magnetic fields