{
  "abstract": "The cold dark matter paradigm successfully explains large-scale structure but faces persistent tensions on small scales. Warm dark matter (WDM) with $\\mathrm{keV}$-scale particles can alleviate these issues by suppressing small-scale structure formation. The presence of collapsed structures at high redshifts places strong lower limits on the WDM particle mass $m_x$. Gamma-ray bursts (GRBs) are ideal high-redshift probes due to their extreme brightness. Using the most recent \\emph{Swift} GRB data accumulated over the past two decades, we derive robust constraints on $m_x$ by conservatively assuming that the comoving GRB formation rate is proportional to the cosmic star formation rate (SFR), with an additional redshift evolution parameterized as $(1+z)^α$. Applying a maximum-likelihood analysis to 118 GRBs with redshift $z<10$ and luminosity $L\\ge 4.0\\times10^{52}\\,\\mathrm{erg\\,s^{-1}}$, we obtain $m_x \\gtrsim 1.23\\,\\mathrm{keV}$ and $α=1.57^{+1.14}_{-0.57}$ at the 95\\% confidence level (CL). The no-evolution scenario ($α=0$), in which the GRB rate exactly traces the SFR without additional redshift evolution, is excluded at the $5σ$ level. Adopting the best-fit value $α=1.57$ as a prior tightens the lower limit on $m_x$ to $m_x \\gtrsim 1.59\\,\\mathrm{keV}$ at the 95\\% CL. These robust constraints demonstrate that GRBs are a powerful probe of the early Universe. A better understanding of the relationship between the GRB rate and the SFR would enable even tighter limits on WDM models.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: Mon Not R Astron Soc (2026)",
  "arxiv": "2607.25261",
  "author_total": 7,
  "authors": [
    {
      "name": "Jun-Jie Wei"
    },
    {
      "name": "Jing-Meng Hao"
    },
    {
      "name": "Ding-Fang Hu"
    },
    {
      "name": "Yang Liu"
    },
    {
      "name": "Bao Wang"
    },
    {
      "name": "Xi Kang"
    },
    {
      "name": "Xue-Feng Wu"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/6n4vktx0xqq73.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2607.25261",
  "fulltext_url": null,
  "id": "6n4vktx0xqq73",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2607.25261",
  "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.CO"
    ],
    [
      "arxiv",
      "astro-ph.GA"
    ],
    [
      "arxiv",
      "astro-ph.HE"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2607.25261",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-09",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/6n4vktx0xqq73.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:25:31Z",
      "native_id": "2607.25261",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2607.25261"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.CO",
      "subfield": "cosmology"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.HE",
      "subfield": "high-energy-astrophysics"
    }
  ],
  "title": "Tightening Bounds on Warm Dark Matter with High-Redshift Gamma-Ray Bursts",
  "title_text": "Tightening Bounds on Warm Dark Matter with High-Redshift Gamma-Ray Bursts",
  "type": "preprint",
  "updated_at": "2026-10-30T12:25:31Z",
  "url": "https://research.draconitic.com/paper/6n4vktx0xqq73",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1093/mnras/stag1720",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}