Radial Oscillations of Hybrid Stars

  title={Radial Oscillations of Hybrid Stars},
  author={V.K.Gupta and Vinita Tuli and Ashok Goyal},
  journal={arXiv: Astrophysics},
We study the effect of quark and nuclear matter mixed phase on the radial oscillation modes of neutron stars. For this study we have considered recent models from two classes of equations of state namely the relativistic mean field theoretical models and models based on realistic nucleon-nucleon interactions incorporating relativistic corrections and three body nuclear interactions. 
In this work, we investigate the effect of color superconductivity in adiabatic radial oscillations of stars consisting of quark matter. We calculate the equilibrium configurations by integrating theExpand
Hybrid stars
Recently there have been important developments in the determination of neutron star masses which put severe constraints on the composition and equation of state (EOS) of the neutron star matter.Expand
In this work we investigate the adiabatic radial oscillations of hybrid stars. We use a relativistic-mean-field model equation of state (EOS) to describe the hadron phase and the Nambu-Jona-LasinioExpand
Equation of state and radial oscillations of neutron stars
We investigate radial oscillations of pure neutron stars and hybrid stars, employing equations of state of nuclear matter from Brueckner-Hartree-Fock theory, and of quark matter from theExpand
Radial oscillations of quark stars with strongly coupled QGP in the interior
The radial oscillations of quark stars are analysed using the recently developed strongly coupled quark–gluon plasma (SCQGP) equation of state. This EOS describes the intermediate to strongly coupledExpand
Phase Transition Effects on the Dynamical Stability of Hybrid Neutron Stars
We study radial oscillations of hybrid non-rotating neutron stars composed by a quark matter core and hadronic external layers. At first, we physically deduce the junction conditions that should beExpand
Radial oscillations of color superconducting self-bound quark stars
We investigate the effect of the color-flavor locking pairing pattern on the adiabatic radial oscillations of pure self-bound quark stars using an equation of state in the framework of the MIT bagExpand
It is believed that quark stars or neutron stars with mixed phase in the core have smaller radii compared to ordinary compact stars. With the recent observation of several low radius objects,Expand
Acoustic modes of pulsating axion stars: Nonradial oscillations
We compute the lowest frequency nonradial oscillation modes of dilute axion stars. The effective potential that enters into the Schrödinger-like equation, several associated eigenfunctions and theExpand
Radial oscillations of boson stars made of ultralight repulsive dark matter
We compute the lowest frequency radial oscillation modes of boson stars. It is assumed that the object is made of pseudo-Goldstone bosons subjected to a scalar potential that leads to a repulsiveExpand


Radial oscillations of relativistic stars
We present a new survey of the radial oscillation modes of neutron stars. This study complements and corrects earlier studies of radial oscillations. We present an extensive list of frequencies forExpand
Radial Modes of Neutron Stars with a Quark Core
We make a first calculation of eigenfrequencies of radial pulsations of neutron stars with quark cores in a general relativistic formalism given by Chandrasekhar. The equations of state used toExpand
▪ Abstract We review recent progress in the theory of neutron stars and compare its predictions with the observational data on masses, radii, and temperatures. The theory of neutron stars made up ofExpand
The radial oscillations of neutron stars
Recherche de l'influence de l'equation d'etat de la matiere (dans un regime a densite nucleaire) sur le comportement dynamique des etoiles a neutrons. On presente les proprietes des deux modesExpand
Effects of Rapid Stellar Rotation on Equation-of-State Constraints Derived from Quasi-periodic Brightness Oscillations
Quasi-periodic X-ray brightness oscillations (QPOs) with frequencies 1 kHz have now been discovered in more than a dozen neutron stars in low-mass X-ray binary systems using the Rossi X-Ray TimingExpand
The inner boundary of a neutron-star crust
Abstract The phase boundary between the liquid matter of the interior of a neutron star and the solid matter that comprises the crust is studied. The matter is assumed to consist of electrons andExpand
Neutron star crusts.
Property of neutron star matter at subnuclear densities using an improved nuclear Hamiltonian is calculated, finding that the thinner crust and the unusual nuclear shape have important consequences for theories of the rotational and thermal evolution of neutron stars, especialy theories of glitches. Expand
Constraints on the equation of state of neutron star matter from observations of kilohertz QPOs
Abstract The frequencies of the highest-frequency kilohertz QPOs recently discovered in some sixteen neutron stars in low-mass X-ray binary systems are most likely the orbital frequencies of gas inExpand
Bounds on the Compactness of Neutron Stars from Brightness Oscillations during X-Ray Bursts
The discovery of high-amplitude brightness oscillations at the spin frequency or its first overtone in six neutron stars in low-mass X-ray binaries during type I X-ray bursts provides a powerful newExpand
Radial oscillations of zero-temperature white dwarfs and neutron stars below nuclear densities
Radial oscillations of zero-temperature degenerate stars with subnuclear densities have been calculated for the fundamental and first two excited modes using recent equations of state. TheExpand