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Primordial Black Hole Interpretation in Subsolar Mass Gravitational Wave Candidate SSM200308

Published 4 Apr 2024 in astro-ph.CO, gr-qc, and hep-ph | (2404.03328v3)

Abstract: In the recent second part of the third observation run by the LIGO-Virgo-KAGRA collaboration, a candidate with sub-solar mass components was reported, which we labelled as SSM200308. This study investigates the premise that primordial black holes (PBHs), arising from Gaussian perturbation collapses, could explain SSM200308. Through Bayesian analysis, we obtain the primordial curvature power spectrum that leads to the merger rate of PBHs aligning with observational data as long as they constitute {$f_{\mathrm{PBH}}=5.66{+58.68}_{-5.44}\times 10{-2}$ } of the dark matter. However, while the gravitational wave (GW) background from binary PBH mergers is within current observational limits, the scalar-induced GWs associated with PBH formation exceed the constraints imposed by pulsar timing arrays, challenging the Gaussian perturbation collapse PBH model as the source of SSM200308.

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Authors (2)

  1. Chen Yuan 
  2. Qing-Guo Huang 

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