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scienceSaturday, November 7, 2026 at 01:49 AM
JWST UV Luminosity Functions Tighten Neutrino Self-Interaction Bounds Beyond Planck Limits

JWST UV Luminosity Functions Tighten Neutrino Self-Interaction Bounds Beyond Planck Limits

The preprint shows JWST high-redshift UV luminosity functions constrain neutrino self-interactions more tightly than CMB data alone by probing small-scale power spectrum changes. Limits improve to Log10(Geff) ≈ −2.75 (single flavor) and −3.41 (three flavors). Future deeper surveys are needed to confirm candidates and reduce modeling uncertainties.

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This work connects JWST’s unexpected early galaxy population to fundamental neutrino physics, showing how small-scale structure observables complement terrestrial experiments. Key limitations include reliance on hierarchical structure formation assumptions and current high-z candidate purity; deeper JWST surveys with spectroscopic confirmation will strengthen the evidence.

Sources (2)

  • [1]
    Primary Source(https://arxiv.org/abs/2611.07013)
  • [2]
    Supporting Source(https://arxiv.org/abs/1807.06209)