Gravitational-wave Emission from a Primordial Black Hole Inspiraling inside a Compact Star: a Novel Probe for Dense Matter Equation of State

Abstract

Primordial black holes of planetary masses captured by compact stars are widely studied to constrain their composition fraction of dark matter. Such a capture may lead to an inspiral process and be detected through gravitational wave signals. In this Letter, we study the post-capture inspiral process by considering two different kinds of compact stars, i.e., strange stars and neutron stars. The dynamical equations are numerically solved and the gravitational wave emission is calculated. It is found that the Advanced LIGO can detect the inspiraling of a $10^{-5}$ solar mass primordial black hole at a distance of 10 kpc, while a Jovian-mass case can even be detected at megaparsecs. Promisingly, the next generation gravitational wave detectors can detect the cases of $10^{-5}$ solar mass primordial black holes up to $\sim 1$ Mpc, and can detect Jovian-mass cases at several hundred megaparsecs. Moreover, the kilohertz gravitational wave signal shows significant differences for strange stars and neutron stars, potentially making it a novel probe to the dense matter equation of state.

15 pages, 7 figures, accepted by ApJL

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Cited by in corpus (13)

• The Lunar Gravitational-wave Antenna: Mission Studies and Science Case
• Gravitational wave constraints on planetary-mass primordial black holes using LIGO O3a data
• Primordial black holes captured by neutron stars: relativistic point-mass treatment
• Recent progresses in strange quark stars
• Stability and Observability of Magnetic Primordial Black Hole-Neutron Star Collisions
• Impact of radiation from primordial black holes on the 21-cm angular-power spectrum in the dark ages
• Study of hybrid stars with nonstrange quark matter cores
• Neutrino signals from Neutron Star implosions to Black Holes
• Gravitational Wave Emission from Close-in Strange Quark Planets Around Strange Stars with Magnetic Interactions
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• Cosmological abundance of primordial black holes in mixed dark matter scenarios incorporating Kaluza-Klein dark matter
• Gravitational Waves from Strange Star Core-Crust Oscillation
• Gravitational waves from primordial black holes passing by neutron stars: observational prospects for the Galactic center