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- W4224052012 abstract "In this work, we propose a new subclass of extreme-mass-ratio-inspirals (EMRIs): mass-gap EMRIs, consisting of a compact object in the lower mass gap $ensuremath{sim}(2.5ensuremath{-}5)text{ }text{ }{M}_{ensuremath{bigodot}}$ and a massive black hole (MBH). The mass-gap object (MGO) may be a primordial black hole or produced from a delayed supernova explosion. We calculate the formation rate of mass-gap EMRIs in both the (dry) loss-cone channel and the (wet) active galactic nucleus disk channel by solving Fokker-Planck-type equations for the phase-space distribution. In the dry channel, the mass-gap EMRI rate is strongly suppressed compared to the EMRI rate of stellar-mass black holes (SBHs) as a result of mass segregation effect. In the wet channel, the suppression is roughly equal to the mass ratio of SBHs over MGOs, because the migration speed of a compact object in an active galactic nucleus disk is proportional to its mass. We find that the wet channel is much more promising to produce mass-gap EMRIs observable by spaceborne gravitation wave detectors. (Non)detection of mass-gap EMRIs may be used to distinguish different supernova explosion mechanisms and constrain the abundance of primordial black holes around MBHs." @default.
- W4224052012 created "2022-04-19" @default.
- W4224052012 creator A5015795854 @default.
- W4224052012 creator A5049426818 @default.
- W4224052012 creator A5090410517 @default.
- W4224052012 date "2022-04-13" @default.
- W4224052012 modified "2023-09-26" @default.
- W4224052012 title "Mass-gap extreme mass ratio inspirals" @default.
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