Radial oscillations in neutron stars from QCD

Abstract

We study the stability against infinitesimal radial oscillations of neutron stars generated by a set of equations of state obtained from first-principle calculations in cold and dense QCD and constrained by observational data. We consider mild and large violations of the conformal bound, $c_s=1/\sqrt{3}$, in stars that can possibly contain a quark matter core. Some neutron star families in the mass-radius diagram become dynamically unstable due to large oscillation amplitudes near the core.

8 pages, 5 figures

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• Compact stars in Rastall gravity: hydrostatic equilibrium and radial pulsations
• Causality violation and the speed of sound of hot and dense quark matter in the Nambu--Jona-Lasinio model
• Hybrid stars with reactive interfaces: analysis within the Nambu-Jona-Lasinio model
• Fractionalized Quasiparticles in Dense Baryonic Matter
• Fundamental-mode eigenfrequencies of neutral and charged twin neutron stars
• Phase transition and stiffer core fluid in neutron stars: Effects on stellar configurations, dynamical stability, and tidal deformability
• Exploring Radial Oscillations in Slow Stable and Hybrid Neutron Stars
• On the stability of electrostatics stars with modified non-gauge invariant Einstein-Maxwell gravity