Precise constraint on properties of neutron stars through new universal relations and astronomical observations
arXiv:2503.03981 · doi:10.1088/1674-1137/ad9301
Abstract
In view of the great uncertainty of the equation of state (EOS) of high-density nuclear matter, establishing EOS-independent universal relations between global properties of neutron stars provides a practical way to constrain the unobservable or difficult-to-observe properties through astronomical observations. It is common to construct universal relations between EOS-dependent properties (e.g., moment of inertia, tidal deformation, etc.) or combined properties (e.g., compactness). Improving the precision of the universal relations may provide stricter constraint on the properties of neutron star. We find that in 3-dimensional space with mass and radius as the base coordinates, the points corresponding to a certain property of neutron star described by different EOSs are almost located in the same surface. Thus the universal relation between the property and the stellar mass-radius can be expressed through describing the surface. It is shown that the resulting universal relations have higher precisions. As an example, we construct high-precision universal relations for the moment of inertia, the -mode frequency, and the dimensionless tidal deformation respect to the mass-radius. As the observational data of neutron star mass and radius from NICER grows in data and accuracy, these universal relations allow for more precise constraints on the unobservable or difficult-to-observe properties.
References in corpus (19)
- Gravitational Waves and Gamma-rays from a Binary Neutron Star Merger: GW170817 and GRB 170817A
- GW190814: Gravitational Waves from the Coalescence of a 23 M Black Hole with a 2.6 M Compact Object
- Tidal Love numbers of neutron stars
- A NICER View of the Massive Pulsar PSR J0740+6620 Informed by Radio Timing and XMM-Newton Spectroscopy
- Constraining Neutron-Star Matter with Microscopic and Macroscopic Collisions
- Shell Structure and -Tensor Correlations in Density-Dependent Relativistic Hartree-Fock theory
- Multimessenger constraints for ultra-dense matter
- Fundamental oscillation modes of neutron stars: validity of universal relations
- Universal Relations for Neutron Star F-Mode and G-Mode Oscillations
- Effect of hyperons on f-mode oscillations in Neutron Stars
- GW170817 implications on the frequency and damping time of f-mode oscillations of neutron stars
- Gravitational-Wave and X-ray Probes of the Neutron Star Equation of State
- Universal relations for compact stars with heavy baryons
- Rapidly rotating neutron stars: Universal relations and EOS inference
- Parameters of rotating neutron stars with and without hyperons
- Empirical radius formulas for canonical neutron stars from bidirectionally selecting EOS features in extended Bayesian analyses of observational data
- Universal Relations for rapidly rotating neutron stars using supervised machine-learning techniques
- Quasi-universal relations in the context of future neutron star detections
- Moment of Inertia for Axisymmetric Neutron Stars in the Standard-Model Extension