{
  "abstract": "Our Universe serves as a complementary laboratory for particle physics interactions. One intriguing possibility is that neutrinos may have beyond-the-Standard-Model (BSM) self-interactions, which can delay their free streaming and have an observable effect across different redshifts. Such interactions can induce scale-dependent changes in the matter power spectrum. The James Webb Space Telescope (JWST) has opened up a new window onto the early Universe by discovering a large population of high-redshift galaxies up to $z \\sim 15$ and various probable galaxy candidates at even higher redshifts, between $z \\sim 15-30$. Such high-redshift observations can probe the matter power spectrum on small scales, since structure formation is hierarchical and the structures hosting these high-redshift galaxies are therefore expected to be small. We, $\\textit{for the first time}$, use the UV luminosity function data from JWST and combine them with the $\\textit{Planck}$ CMB data to probe neutrino self-interactions ($ν$SI). If only one neutrino flavor experiences such BSM interactions, then $\\textit{Planck}$ + JWST data give a 95% C.L. upper limit on $\\mathrm{Log}_{10}(G_{\\mathrm{eff}}/\\mathrm{MeV}^{-2})$ $\\approx$ $-2.75$ and when all three flavors are interacting, the corresponding constraint becomes $\\lesssim -3.41$; both stronger than those obtained using only $\\textit{Planck}$ data. Our results highlight the power of this new observable, the high-redshift UV luminosity function from JWST as a complementary probe to terrestrial experiments, showing that small-scale observables can open a new window onto smaller neutrino self-interaction strengths.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2611.07013",
  "author_total": 5,
  "authors": [
    {
      "name": "Ranjini Mondol"
    },
    {
      "name": "Priyank Parashari"
    },
    {
      "name": "Anirban Das"
    },
    {
      "name": "Vera Gluscevic"
    },
    {
      "name": "Ranjan Laha"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/47v7znp46gnq2.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2611.07013",
  "fulltext_url": null,
  "id": "47v7znp46gnq2",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2611.07013",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.CO"
    ],
    [
      "arxiv",
      "hep-ph"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2611.07013",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-04",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/47v7znp46gnq2.ris",
  "sources": [
    {
      "first_seen": "2026-11-06T18:21:30Z",
      "native_id": "2611.07013",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2611.07013"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.CO",
      "subfield": "cosmology"
    },
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "Latest $ν$s from the Earliest Galaxies: Probing neutrino self-interactions with JWST",
  "title_text": "Latest νs from the Earliest Galaxies: Probing neutrino self-interactions with JWST",
  "type": "preprint",
  "updated_at": "2026-11-09T00:20:39Z",
  "url": "https://research.draconitic.com/paper/47v7znp46gnq2",
  "venue": "arXiv",
  "versions": []
}