Radial and Non-Radial Oscillations of Inverted Hybrid Stars

Abstract

We study the radial and non-radial oscillations of Cross stars (CrSs), i.e., stars with a quark matter crust and a hadronic matter core in an inverted order compared to conventional hybrid stars. We draw comparisons of their oscillation modes with those of neutron stars, quark stars, and conventional hybrid stars. We find that the stellar stability analysis from the fundamental mode of radial oscillations, and the $g$, $f$ modes of non-radial oscillations are quite similar to those of conventional hybrid stars. However, due to the inverted stellar structure, the first non-radial $p$ mode of CrSs behaves in an inverted way and sits in a higher frequency domain compared to that of conventional hybrid stars. These results provide a direct way to discriminate CrSs from other types of compact stars via gravitational-wave probes. Specifically, compact stars emitting $g$-mode gravitational waves within the $0.5$-$1$ kHz range should be CrSs or conventional hybrid stars rather than neutron stars or pure quark stars, and a further GW detection of the first $p$ mode above 8 kHz or an identification of a decreasing trend of frequencies versus star masses associated with it will help identify the compact object to be a CrS rather than a conventional hybrid star.

13 pages, 7 figures. Published version

References in corpus (55)

• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• A Massive Pulsar in a Compact Relativistic Binary
• GW190814: Gravitational Waves from the Coalescence of a 23 M${}_{\odot }$ Black Hole with a 2.6 M${}_{\odot }$ Compact Object
• 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
• GW190425: Observation of a Compact Binary Coalescence with Total Mass $\sim 3.4M_{\odot }$
• Color superconductivity in dense quark matter
• A NICER View of the Massive Pulsar PSR J0740+6620 Informed by Radio Timing and XMM-Newton Spectroscopy
• PSR J0952-0607: The Fastest and Heaviest Known Galactic Neutron Star
• Proto-Neutron and Neutron Stars in a Chiral SU(3) Model
• Torsional Oscillations of Relativistic Stars with Dipole Magnetic Fields
• Signatures of hadron-quark mixed phase in gravitational waves
• Multipolar universal relations between f-mode frequency and tidal deformability of compact stars
• Fundamental oscillation modes of neutron stars: validity of universal relations
• Unified Interacting Quark Matter and its Astrophysical Implications
• Universal Relations for Neutron Star F-Mode and G-Mode Oscillations
• Relativistic hybrid stars in light of the NICER PSR J0740+6620 radius measurement
• Quark-nuclear hybrid equation of state for neutron stars under modern observational constraints
• Fast Rotating Relativistic Stars: Spectra and Stability without Approximation
• Asteroseismology: radial oscillations of neutron stars with realistic equation of state
• GW170817 implications on the frequency and damping time of f-mode oscillations of neutron stars
• Impact of the equation of state on $f$- and $p$- mode oscillations of neutron stars
• Constraining hadron-quark phase transition parameters within the quark-mean-field model using multimessenger observations of neutron stars
• Discontinuity gravity modes in hybrid stars: assessing the role of rapid and slow phase conversions
• Probing up-down quark matter via gravitational waves
• Universal relations for rapidly rotating cold and hot hybrid star
• Non-strange quark stars from NJL model with proper-time regularisation
• Quasi-normal g-modes of neutron stars with quarks
• Interacting $ud$ and $uds$ quark matter at finite densities and quark stars
• Quantum nucleation of up-down quark matter and astrophysical implications
• GW190814: Circumstantial Evidence for Up-Down Quark Star
• Framework for phase transitions between the Maxwell and Gibbs constructions
• Rotation and deformation of strangeon stars in the Lennard-Jones model
• Oscillation Modes and Gravitational Waves from Strangeon Stars
• Ultracompact hybrid stars consistent with multimessenger astrophysics
• Fast Rotating Neutron Stars: Oscillations and Instabilities
• Effect of color superconductivity on the mass of hybrid neutron stars in an effective model with pQCD asymptotics
• Gravitational wave echoes from interacting quark stars
• Asteroseismology using quadrupolar f-modes revisited: breaking of universal relationships in the slow hadron-quark conversion scenario
• Non-strange quark stars within resummed QCD
• Hybrid Strangeon Stars
• A bag model of matter condensed by the strong interaction
• Supercritically charged objects and electron-positron pair creation
• Frequencies of $f$- and $p$-oscillation modes in cold and hot compact stars
• Oscillations of Highly Magnetized Non-rotating Neutron Stars
• Interface effects of quark matter: Light-quark nuggets and compact stars
• Bulk Strong Matter: the Trinity
• Stellar Structure and Stability of Charged Interacting Quark Stars and Their Scaling Behaviour
• Rescaling strange-cluster stars and its implications on gravitational-wave echoes
• The study of nonstrange quark stars within a modified NJL model
• Universality in quasinormal modes of neutron stars with quark-hadron crossover
• Hybrid stars may have an inverted structure
• Free Energy of Anisotropic Strangeon Stars
• Fundamental-mode eigenfrequencies of neutral and charged twin neutron stars
• $g$-mode of neutron stars in pseudo-Newtonian gravity

Cited by in corpus (10)

• Universal relations for anisotropic interacting quark stars
• Effects of dark boson mediated feeble interaction between dark matter (DM) and quark matter on $f$-mode oscillation of DM admixed quark stars
• Observational Probes of the Neutron Star Equation of State with Hyperons, Bosonic Dark Matter, and Quark Matter
• Non-radial oscillations of hadronic neutron stars, quark stars, and hybrid stars : Calculation of $f$, $p$, and $g$ mode frequencies
• Effects of inner crusts on $g$-mode oscillations in neutron stars
• Vetting quark-star models with gravitational waves in the hierarchical Bayesian framework
• Suppression of composition $g$-modes in chemically-equilibrating warm neutron stars
• Confronting recent light compact star observations with color-flavor locked quark matter
• Rotational Properties of Inverted Hybrid Stars
• Constraining the competition between the deconfinement and chiral phase transitions in light of the multimessenger era