{
  "abstract": "We forecast the sensitivity of a joint fast radio burst (FRB) and galaxy survey to local primordial non-Gaussianity using the full $3\\times2$-point statistic: the angular dispersion-measure (DM) auto-spectrum, the DM-galaxy cross-spectrum, and the galaxy auto-spectrum. Local primordial non-Gaussianity imprints a scale-dependent bias on both the free-electron field probed by FRB dispersion measures and the galaxy field. Hence, all three spectra carry information on the local non-Gaussianity amplitude $f_{\\rm NL}$. Adopting a DESI-like luminous-red-galaxy sample and an FRB population over 35% of the sky, we forecast $σ(f_{\\rm NL}) \\simeq 5$ for both $N_{\\rm FRB} = 10^4$ and $10^5$ at fixed Planck 2018 cosmology, marginalised over three astrophysical bias parameters $(b_e^0, z_{\\rm fb}, b_g^{\\rm amp})$. The $f_{\\rm NL}$ constraint is robust to marginalising over the six $Λ$CDM parameters $(ω_b, ω_{\\rm cdm}, h, A_s, n_s, τ)$ with Planck priors. At these sample sizes, the galaxy auto-spectrum sets the constraint, while the DM sector's contribution grows with the burst count and becomes decisive for the larger samples anticipated in the SKA era, reaching $σ(f_{\\rm NL}) \\simeq 2$ at $10^7$ bursts.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.38735",
  "author_total": 2,
  "authors": [
    {
      "name": "Indranil Das"
    },
    {
      "name": "Gilbert Holder"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/5qbshh3x44ntj.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.38735",
  "fulltext_url": null,
  "id": "5qbshh3x44ntj",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.38735",
  "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"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2610.38735",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-28",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/5qbshh3x44ntj.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:36:23Z",
      "native_id": "2610.38735",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.38735"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.CO",
      "subfield": "cosmology"
    }
  ],
  "title": "Probing the local primordial non-Gaussianity with clustering of FRB dispersion measure and galaxies",
  "title_text": "Probing the local primordial non-Gaussianity with clustering of FRB dispersion measure and galaxies",
  "type": "preprint",
  "updated_at": "2026-11-01T12:20:45Z",
  "url": "https://research.draconitic.com/paper/5qbshh3x44ntj",
  "venue": "arXiv",
  "versions": []
}