'Not-quite-primordial' black holes explain JWST puzzle — SkimNews
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- Wenzer Qin, Neal Weiner, and Soubhik Kumar (NYU and Tufts) proposed that 'not-quite-primordial' black holes formed inside clumps of dark matter in the early universe, with the hot cosmic microwave background preventing gas and dust from collapsing into smaller black holes instead.
- The theory aims to explain the 'little red dots' — distant galaxies that JWST has identified hosting surprisingly large numbers of ancient black holes, which Priyamvada Natarajan at Yale says far exceed even her fellow theorists' most optimistic predictions.
- Traditional primordial black hole models require violent space-time spasms in the very early universe, but those conflict with the mild ripples actually observed in the CMB, forcing theorists to invoke complicated new physical laws.
- John Regan at Maynooth University, who was not involved in the paper, called the new model attractive because it 'invokes less speculative physics than traditional primordial black hole physics.'
- The team plans to simulate the formation process and predict the light spectrum around these black holes, then compare those predictions with JWST data, and is also eyeing the proposed Primordial Inflation Explorer (PIXIE) satellite to measure the CMB precisely enough to test the idea.
- The paper was published in Physical Review Letters (DOI: 10.1103/zfjm-8fnt).
Why it matters: JWST keeps spotting far more ancient black holes than theory predicted, forcing cosmologists to either accept exotic primordial-black-hole physics that conflicts with the smooth CMB, or hunt for alternatives. This team's 'not-quite-primordial' model threads the needle using only known physics plus dark matter — and outside expert Natarajan endorsed the logic.
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