Exploring Radial Oscillations in Slow Stable and Hybrid Neutron Stars
arXiv:2401.08347 · doi:10.1088/1475-7516/2025/09/025
Abstract
In the era of gravitational wave astronomy, radial oscillations hold significant potential for not only uncovering the microphysics behind the internal structure but also investigating the stability of neutron stars (NSs). We start by constructing families of static NSs following nucleonic, quarkyonic, and hybrid equations of state and then subject them to radial perturbations in order to explore the stability of these stars. Unlike other literature where the fluid elements are assumed to be in chemical equilibrium, we consider the out-of-equilibrium effects on the chemical composition of fluid elements for the calculation of radial modes. Taking these considerations into account, we observe that the sound speed () and adiabatic index () avoid singularities and discontinuities over the equilibrium case. We elucidate the response of the fundamental radial modes by examining the out-of-equilibrium matter distribution scenario, offering insights into its dynamic variations. We also demonstrate that this approach extends the stable branches of stellar models, enabling stars to sustain stable higher-order mass doublets, shedding some light on observation and existence of PSR J0740+6620.
arXiv commentComments and suggestions are welcome
References in corpus (67)
- GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
- A Massive Pulsar in a Compact Relativistic Binary
- The equation of state for nucleon matter and neutron star structure
- Quasinormal modes of black holes and black branes
- Quasi-Normal Modes of Stars and Black Holes
- 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
- Relativistic Shapiro delay measurements of an extremely massive millisecond pulsar
- Quasinormal modes of black holes: from astrophysics to string theory
- A NICER View of the Massive Pulsar PSR J0740+6620 Informed by Radio Timing and XMM-Newton Spectroscopy
- Short-Duration Gamma-Ray Bursts
- Relativistic Equation of State of Nuclear Matter for Supernova and Neutron Star
- Relativistic Mean-Field Theory and the High-Density Nuclear Equation of State
- Neutron skins and neutron stars in the multi-messenger era
- A Chiral Effective Lagrangian for Nuclei
- Sound velocity bound and neutron stars
- Symmetry Energy II: Isobaric Analog States
- Resonant Oscillations and Tidal Heating in Coalescing Binary Neutron Stars
- Constraining neutron star matter with QCD
- On the Sound Speed in Neutron Stars
- Analysis of Chiral Mean-Field Models for Nuclei
- The Radius of the High-mass Pulsar PSR J0740+6620 with 3.6 yr of NICER Data
- Radial oscillations of relativistic stars
- Phase transition effects on the dynamical stability of hybrid neutron stars
- Quarkyonic Matter Equation of State in Beta-Equilibrium
- Vector interaction enhanced bag model for astrophysical applications
- Equation of State for Nucleonic and Hyperonic Neutron Stars with Mass and Radius Constraints
- Symmetry energy from the nuclear collective motion: constraints from dipole, quadrupole, monopole and spin-dipole resonances
- Effects of dark matter on the nuclear and neutron star matter
- New relativistic effective interaction for finite nuclei, infinite nuclear matter and neutron stars
- Pairing Properties In Relativistic Mean Field Models Obtained From Effective Field Theory
- Gravitational Waves from Nonlinear Couplings of Radial and Polar Nonradial Modes in Relativistic Stars
- New parameterization of the effective field theory motivated relativistic mean field model
- Inference of the sound speed and related properties of neutron stars
- A general, scale-independent description of the sound speed in neutron stars
- Constraining strangeness in dense matter with GW170817
- g-mode Oscillations in Hybrid Stars: A Tale of Two Sounds
- Large Sound Speed in Dense Matter and the Deformability of Neutron Stars
- Short gamma-ray bursts within 200 Mpc
- Coupling of Radial and Axial non-Radial Oscillations of Compact Stars: Gravitational Waves from first-order Differential Rotation
- Radial Oscillations of Dark Matter admixed Neutron Stars
- Investigating Dark Matter-Admixed Neutron Stars with NITR Equation of State in Light of PSR J0952-0607
- -modes of neutron stars with hadron-to-quark crossover transitions
- Quasi-normal g-modes of neutron stars with quarks
- Sensitivity of elements of the symmetry energy of nuclear matter to the properties of neutron-rich systems
- A reliable description of the radial oscillations of compact stars
- Searching for hypermassive neutron stars with short gamma-ray bursts
- A model-agnostic analysis of hybrid stars with reactive interfaces
- Systematic analysis of the impacts of symmetry energy parameters on neutron star properties
- Warm dense matter and cooling of supernovae remnants
- Two first-order phase transitions in hybrid compact stars: higher-order multiplet stars, reaction modes and intermediate conversion speeds
- Framework for phase transitions between the Maxwell and Gibbs constructions
- Structure in the speed of sound: from neutron stars to heavy-ion collisions
- The effect of isoscalar-isovector coupling in infinite nuclear matter
- g-mode Oscillations in Neutron Stars with Hyperons
- Could a slow stable hybrid star explain the central compact object in HESS~J1731-347?
- Effect of isospin asymmetry in nuclear system
- Probing the Impact of WIMP Dark Matter on Universal Relations, GW170817 Posterior and Radial Oscillations
- Impact of slow conversions on hybrid stars with sequential QCD phase transitions
- A short gamma-ray burst from a proto-magnetar remnant
- Asteroseismology using quadrupolar f-modes revisited: breaking of universal relationships in the slow hadron-quark conversion scenario
- Polar Quasinormal Modes of Neutron Stars in Massive Scalar-Tensor Theories
- Radial instability of trapping polytropic spheres
- Speed of Sound for Hadronic and Quark Phases in a Magnetic Field
- Analyzing the speed of sound in neutron star with machine learning
- Non-equilibrium effects on stability of hybrid stars with first-order phase transitions
- Radial oscillations in neutron stars from QCD