Normal oscillation modes and radial stability of neutron stars with a dark-energy core from the Chaplygin gas

Abstract

As a potential candidate for the late-time accelerating expansion of the Universe, the Chaplygin gas and its generalized models have significant implications to modern cosmology. In this work we investigate the effects of dark energy on the internal structure of a neutron star composed of two phases, which leads us to wonder: Do stable neutron stars have a dark-energy core? To address this question, we focus on the radial stability of stellar configurations composed by a dark-energy core -- described by a Chaplygin-type equation of state (EoS) -- and an ordinary-matter external layer which is described by a polytropic EoS. We examine the impact of the rate of energy densities at the phase-splitting surface, defined as $\alpha ={\rho }_{\mathrm{dis}}^{-}/{\rho }_{\mathrm{dis}}^{+}$, on the radius, total gravitational mass and oscillation spectrum. The resulting mass-radius diagrams are notably different from dark energy stars without a common-matter crust. Specifically, it is found that both the mass and the radius of the maximum-mass configuration decrease as $\alpha$ becomes smaller. Furthermore, our theoretical predictions for mass-radius relations consistently describe the observational measurements of different massive millisecond pulsars as well as the central compact object within the supernova remnant HESS J1731-347. The analysis of the normal oscillation modes reveals that there are two regions of instability on the $M({\rho }_c)$ curve when $\alpha$ is small enough indicating that the usual stability criterion $dM/d{\rho }_c>0$ still holds for rapid phase transitions. However, this is no longer true for the case of slow transitions.

arXiv comment12 pages, 11 figures. Version accepted in Physical Review D

References in corpus (51)

• Dynamics of dark energy
• Shapiro delay measurement of a two solar mass neutron star
• A Massive Pulsar in a Compact Relativistic Binary
• Cosmological Constant - the Weight of the Vacuum
• An alternative to quintessence
• Generalized Chaplygin Gas, Accelerated Expansion and Dark Energy-Matter Unification
• k-Inflation
• 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
• Kinetically Driven Quintessence
• A NICER View of the Massive Pulsar PSR J0740+6620 Informed by Radio Timing and XMM-Newton Spectroscopy
• Unification of Dark Matter and Dark Energy: the Inhomogeneous Chaplygin Gas
• PSR J0952-0607: The Fastest and Heaviest Known Galactic Neutron Star
• Can the Chaplygin gas be a plausible model for dark energy?
• Dark Energy vs. Modified Gravity
• Stable dark energy stars
• WMAP Constraints on the Generalized Chaplygin Gas Model
• Modified theories of Gravity: Why, How and What?
• Neutron star mass and radius measurements from atmospheric model fits to X-ray burst cooling tail spectra
• Latest Supernova data in the framework of Generalized Chaplygin Gas model
• New generalized Chaplygin gas as a scheme for unification of dark energy and dark matter
• Singularity-free solutions for anisotropic charged fluids with Chaplygin equation of state
• The Dynamics of Relativistic Membranes I: Reduction to 2-dimensional Fluid Dynamics
• On the minimum mass of neutron stars
• Radial oscillations of relativistic stars
• Density Discontinuity of a Neutron Star and Gravitational Waves
• Phase transition effects on the dynamical stability of hybrid neutron stars
• Gravitational waves from pulsating stars: Evolving the perturbation equations for a relativistic star
• Revisiting Generalized Chaplygin Gas as a Unified Dark Matter and Dark Energy Model
• Tolman-Oppenheimer-Volkoff equations in presence of the Chaplygin gas: stars and wormhole-like solutions
• A Note on Classical Solution of Chaplygin-gas as D-brane
• Relativistic Anisotropic Fluid Spheres Satisfying a Non-Linear Equation of State
• Thin-shell wormholes with a generalized Chaplygin gas in Einstein-Born-Infeld theory
• Dawn of the dark: unified dark sectors and the EDGES Cosmic Dawn 21-cm signal
• WMAP5 constraints on the unified model of dark energy and dark matter
• Neutron stars in $f(R,T)$ gravity with conserved energy-momentum tensor: Hydrostatic equilibrium and asteroseismology
• More about the Tolman-Oppenheimer-Volkoff equations for the generalized Chaplygin gas
• Stability and gravitational collapse of neutron stars with realistic equations of state
• Radial pulsations, moment of inertia and tidal deformability of dark energy stars
• Dark Energy, Extra Dimensions, and the Swampland
• Radial oscillations and tidal Love numbers of dark energy stars
• Effect of rainbow function on the structural properties of dark energy star
• Effect of massive graviton on dark energy star structure
• Radial oscillations and gravitational wave echoes of strange stars for various equations of state
• Revisiting Chaplygin gas cosmologies with the recent observations of high-redshfit quasars
• Behavior of anisotropic fluids with Chaplygin equation of state in Buchdahl spacetime
• Impacts of symmetry energy slope on the oscillation frequencies of neutron stars with short-range correlation and admixed dark matter
• An extended analysis for a generalized Chaplygin gas model
• Wormholes admitting conformal Killing vectors and supported by generalized Chaplygin gas
• A Generalized Double Chaplygin Model for Anisotropic Matter: The Newtonian Case
• Probing extra dimensions through cosmological observations of dark energy

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