NS and Primordial BH
| Category | Progenitor | Type | Energy Mechanism | Emission Mechanism | Counterparts | References | Brief Comments | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| LF Radio | HF Radio | Microwave | Terahertz | Optical/IR | X-rays | Gamma-rays | Gravitational Waves | Neutrinos | |||||||
| Collision / Interaction | NS and Primordial BH | Both | Mag. reconnection | -- | Yes | -- | -- | -- | -- | -- | -- | Yes | -- | https://arxiv.org/pdf/1704.05931.pdf | None |
Definitions: LF Radio (3 MHz to 3 GHz); HF Radio (3 GHz to 30 GHz); Microwave (30 to 300 GHz)
Model Description
FRBs may result from interactions between NSs and primordial black holes (PBHs). As a PBH passes through a NS, the gravitational drag from the dense NS matter causes the PBH to slow down. The PBH will pass through the middle of the NS and, after losing sufficient kinetic energy, will be pulled back. The PBH will oscillate a few times before settling at the center of the NS. Here, the PBH will begin to accrete the NS until it is swallowed, causing the NS magnetosphere to be shed. The resulting magnetic reconnection releases an FRB. A repeating FRB may also be accounted for in this scenario: a small PBH will take longer to accrete the NS; as the NS is gradually consumed, multiple bundles of magnetic field lines within the NS may be reconfigured, causing multiple bursts.
Observational Constraints
Gravitational waves are expected counterparts, but may not be detectable at cosmological distances. The model can account multiple peaks, polarized emission and Faraday rotation.