Primordial black holes captured by neutron stars: relativistic point-mass treatment

Abstract

Primordial black holes (PBHs), if they exist, may collide with and be captured by neutron stars. We adopt a relativistic point-mass approximation to study this capture, the subsequent confinement of the PBH of mass $m$ inside the neutron star of mass $M_{\ast }\gg m$, and the PBH's growth by accretion of stellar material. Building on earlier treatments we systematically study the capture, confinement, and accretion process, characterize the emitted quasiperiodic continuous gravitational-wave signal, track the evolution of the PBH's orbital parameters, and compare the effects of different choices for the prescription of the dissipative forces. Our point-mass treatment here is applicable in the limit of small PBH masses, for which its effects on the neutron star can be ignored.

23 pages, 13 figures; matches version published in PRD

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Cited by in corpus (5)

• Evolution of a black hole cluster in full general relativity
• Gravitational wave signals from primordial black holes orbiting solar-type stars
• Tidal effects on primordial black hole capture in neutron stars
• Probing the equation of state of neutron stars with captured primordial black holes
• Gravitational Ionization by Schwarzschild Primordial Black Holes