GW231123's masses and high spins are consistent with primordial black holes that accreted mass and angular momentum in the early universe within the standard PBH framework.
Cosmological evolution of primordial black holes,
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Calculations indicate AMEGO-X could detect PBH transits within 0.1 AU while HAWC and LHAASO could observe explosions out to 0.1-0.5 pc, with future events at ~1000 AU potentially producing measurable electromagnetic signals unlike the 2023 KM3NeT neutrino candidate.
Radiation capture by primordial black holes heavier than 10^15 solar masses modifies cosmic expansion enough for Planck CMB data to bound their abundance below 10 percent.
citing papers explorer
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Electromagnetic Signatures From Primordial Black Holes in the Solar System
Calculations indicate AMEGO-X could detect PBH transits within 0.1 AU while HAWC and LHAASO could observe explosions out to 0.1-0.5 pc, with future events at ~1000 AU potentially producing measurable electromagnetic signals unlike the 2023 KM3NeT neutrino candidate.
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CMB Bounds on Primordial Black Holes via Radiation Capture
Radiation capture by primordial black holes heavier than 10^15 solar masses modifies cosmic expansion enough for Planck CMB data to bound their abundance below 10 percent.