{
  "abstract": "We propose an explanation for the dark matter-baryon coincidence based on collapsing $\\mathbb{Z}_N$ domain walls, which form a novel compact baryonic state: the baryoid. A baryoid has an asteroid-scale mass and up-to-nuclear-scale energy density, and can serve as a dark matter candidate. Starting from equal baryon numbers in the domains formed in the early universe, the collapse of the domain walls after the QCD phase transition leads to a baryon-number ratio of $(N-1):1$ between the false- and true-vacuum domains. Since baryons are slightly lighter in the false-vacuum domains than in the true-vacuum domain, the resulting dark matter-to-baryon energy-density ratio is naturally close to, but slightly smaller than, $(N-1):1$, or $6:1$ for $N=7$. We calculate the domain-wall dynamics and the efficiency of baryon-number trapping, derive the resulting baryoid properties, and discuss a broad set of phenomenological probes.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: JCAP 10 (2026) 026",
  "arxiv": "2605.13958",
  "author_total": 2,
  "authors": [
    {
      "name": "Yang Bai"
    },
    {
      "name": "Ting-Kuo Chen"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/fnxpkep4k3n4p.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2605.13958",
  "fulltext_url": null,
  "id": "fnxpkep4k3n4p",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2605.13958",
  "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/2605.13958",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-10",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/fnxpkep4k3n4p.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:28:36Z",
      "native_id": "2605.13958",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2605.13958"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.CO",
      "subfield": "cosmology"
    },
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "Baryoid Dark Matter from $\\mathbb{Z}_N$ Domain Walls: The $(N-1):1$ origin of the dark matter-baryon coincidence",
  "title_text": "Baryoid Dark Matter from ℤ_N Domain Walls: The (N−1):1 origin of the dark matter-baryon coincidence",
  "type": "preprint",
  "updated_at": "2026-10-30T12:28:36Z",
  "url": "https://research.draconitic.com/paper/fnxpkep4k3n4p",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1088/1475-7516/2026/10/026",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}