Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Mass-gap extreme mass ratio inspirals   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
$\sim (2.5-5) M_\odot$ 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 constrainthe abundance
of primordial black holes around MBHs.

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The categories of this paper are: stat
21
The categories of this paper are: adap-org
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The categories of this paper are: q-fin
4
The categories of this paper are: cond-mat
24
The categories of this paper are: dg-ga
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The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
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The categories of this paper are: mtrl-th
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The categories of this paper are: math-ph
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The categories of this paper are: hep-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: physics
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The categories of this paper are: nlin
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The categories of this paper are: hep-lat
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The categories of this paper are: comp-gas
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The categories of this paper are: bayes-an