{
  "abstract": "We investigate how neutrino--dark matter (DM) interactions modify the flavor composition of high-energy neutrinos from active galactic nuclei (AGNs). Coherent forward scattering in a DM spike around the central supermassive black hole can generate a flavor-dependent potential, inducing flavor conversion as the neutrinos escape. We calculate the flavor composition at Earth for pion-decay and muon-damped sources and find substantial departures from vacuum-oscillation expectations. At neutrino energies around $100\\,\\mathrm{TeV}$, the matter potential begins to compete with vacuum oscillations when the coupling-weighted net DM number density reaches $|ε_α(n_χ-n_{\\barχ})|\\sim10^{18}\\,\\mathrm{cm}^{-3}$. We compare our predictions with IceCube flavor triangle measurements under the illustrative assumption that the diffuse flux originates from AGNs with common neutrino-production and DM-spike properties. Under this assumption, when the DM-induced potential acts on the muon flavor and dominates the vacuum terms at production, the $pγ$ muon-damped predictions lie outside the 95\\% MESE contour. High-energy neutrino flavor measurements can therefore provide a novel probe of neutrino-DM interactions in astrophysical environments.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.26773",
  "author_total": 4,
  "authors": [
    {
      "name": "P. S. Bhupal Dev"
    },
    {
      "name": "Elisa Gaido"
    },
    {
      "name": "Alejandro Ibarra"
    },
    {
      "name": "Yago Porto"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/39z9efbr6crz5.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.26773",
  "fulltext_url": null,
  "id": "39z9efbr6crz5",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.26773",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.HE"
    ],
    [
      "arxiv",
      "hep-ph"
    ],
    [
      "openalex",
      "3106|Neutrino Physics Research"
    ]
  ],
  "openalex": "W7214089877",
  "pdf_url": "https://arxiv.org/pdf/2609.26773",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-22",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/39z9efbr6crz5.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:23:39Z",
      "native_id": "2609.26773",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.26773"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.HE",
      "subfield": "high-energy-astrophysics"
    },
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "Resonant neutrino flavor conversion within dark matter spikes",
  "title_text": "Resonant neutrino flavor conversion within dark matter spikes",
  "type": "preprint",
  "updated_at": "2026-10-30T12:23:39Z",
  "url": "https://research.draconitic.com/paper/39z9efbr6crz5",
  "venue": "arXiv",
  "versions": []
}