Prospects of detection of subsolar mass primordial black hole and white dwarf binary mergers
Physical Review D(2023)
摘要
The subsolar mass primordial black hole (PBH) attracts attention as robust
evidence of its primordial origin against the astrophysical black hole. Not
only with themselves, PBHs can also form binaries with ordinary astrophysical
objects, catching them by gravitational wave (GW) bremsstrahlung. We discuss
the detectability of the inspiral GWs from binaries consisting of a PBH and a
white dwarf (WD) by using space-borne gravitational wave interferometers like
DECIGO. The conservative assessment shows the expected event number in three
years by DECIGO is 𝒪(10^-6) for M_PBH∼ 0.1M_⊙.
Possible enhancement mechanisms of WD-PBH binary formation may amplify this
event rate. We discuss how large enhancement associated with WDs is required to
detect WD-PBH merger events without violating the existing constraints on the
PBH-PBH merger by the ground-based detector.
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