Oscillation Modes and Gravitational Waves from Strangeon Stars

Abstract

The strong interaction at low energy scales determines the equation of state (EOS) of supranuclear matters in neutron stars (NSs). It is conjectured that the bulk dense matter may be composed of strangeons, which are quark clusters with nearly equal numbers of $u$, $d$, and $s$ quarks. To characterize the strong-repulsive interaction at short distance and the nonrelativistic nature of strangeons, a phenomenological Lennard-Jones model with two parameters is used to describe the EOS of strangeon stars (SSs). For the first time, we investigate the oscillation modes of non-rotating SSs and obtain their frequencies for various parameterizations of the EOS. We find that the properties of radial oscillations of SSs are different from those of NSs, especially for stars with relatively low central energy densities. Moreover, we calculate the $f$-mode frequency of nonradial oscillations of SSs within the relativistic Cowling approximation. The frequencies of the $f$-mode of SSs are found to be in the range from $6.7$kHz to $8.7\mathrm{kHz}$. Finally, we study the universal relations between the $f$-mode frequency and global properties of SSs, such as the compactness and the tidal deformability. The results we obtained are relevant to pulsar timing and gravitational waves, and will help to probe NSs' EOSs and infer nonperturbative behaviours in quantum chromodynamics.

8 pages, 10 figures; accepted by MNRAS

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• Radial and Non-Radial Oscillations of Inverted Hybrid Stars
• Universal relations for anisotropic interacting quark stars
• Effects from Dark Matter Halos on X-ray Pulsar Pulse Profiles
• Probing the impact of Delta-Baryons on Nuclear Matter and Non-Radial Oscillations in Neutron Stars
• Quasi-periodic oscillations during magnetar giant flares in the strangeon star model
• Vetting quark-star models with gravitational waves in the hierarchical Bayesian framework
• Non-Radial Oscillation Modes in Hybrid Stars with Hyperons and Delta Baryons
• Effects of inner crusts on $g$-mode oscillations in neutron stars
• $g$-mode of neutron stars in pseudo-Newtonian gravity
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• Normal and Quasinormal Modes of Holographic Multiquark Star