{
  "abstract": "As an alternative to standard dark matter freeze-out via two-body annihilation, strongly interacting massive particles are proposed to regulate their relic abundance through three/four-body self-annihilation. During such freeze-out, dark matter must undergo both number reduction and energy dissipation. The former requires number-reducing processes, and the latter requires an efficient energy-dissipation mechanism. In this work, we propose a novel mechanism where internal Bremsstrahlung processes establish kinetic equilibrium between dark matter and radiation, and thus dissipate energy. More appealingly, this mechanism can be naturally realized in a class of strong dynamics models with flavor-universal quarks and a light axion. To demonstrate our results in a $Sp(4)_c$ dark-color model, we compute all relevant interaction terms and numerically solve the full Boltzmann equations. The same mechanism can also be applied to vector dark matter models.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.02820",
  "author_total": 3,
  "authors": [
    {
      "name": "Xiaoyong Chu"
    },
    {
      "name": "Ajay Kaladharan"
    },
    {
      "name": "Yassine El Mohtadi"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/7hp96ge5zance.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.02820",
  "fulltext_url": null,
  "id": "7hp96ge5zance",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.02820",
  "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|Dark Matter and Cosmic Phenomena"
    ]
  ],
  "openalex": "W7220470232",
  "pdf_url": "https://arxiv.org/pdf/2610.02820",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-02",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/7hp96ge5zance.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:26:45Z",
      "native_id": "2610.02820",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.02820"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.HE",
      "subfield": "high-energy-astrophysics"
    },
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "Kinetic Equilibrium between SIMP Dark Matter and Radiation via Internal Bremsstrahlung",
  "title_text": "Kinetic Equilibrium between SIMP Dark Matter and Radiation via Internal Bremsstrahlung",
  "type": "preprint",
  "updated_at": "2026-10-30T12:26:45Z",
  "url": "https://research.draconitic.com/paper/7hp96ge5zance",
  "venue": "arXiv",
  "versions": []
}