{
  "abstract": "We investigate how a dynamically responsive gas disk changes the influence of self-interacting dark matter (SIDM) on stellar-bar formation. In an isolated Milky-Way-mass galaxy with fixed total baryonic mass, the gas-rich collisionless (CDM) model develops a persistent bar at $1.96\\,\\Gyr$, whereas the matched SIDM model with $\\sigmam=1\\,\\mathrm{cm^2\\,g^{-1}}$ does so at $2.69\\,\\Gyr$. The final stellar $m=2$ amplitude is 0.437 in CDM and 0.340 in SIDM, a 22 per cent suppression; the corresponding gas-free controls remain weak over the same interval. An independently sampled gas-rich pair preserves the direction of both differences. Direct component-force measurements show that the SIDM stellar disk loses $2.82\\times10^{11}\\,\\Msun\\,\\kpc\\,\\kms$ less angular momentum than its CDM counterpart. The integrated torque contrast is dominated by the dark halo (approximately 74 per cent), with a substantial gas contribution (26 per cent), and is redistributed in radius and time rather than being a uniform reduction of halo coupling. Conservation, force-accuracy, aperture, threshold, and independent-sampling checks support the ordering as a dynamical effect within this model. The result demonstrates that a live gas component can change both the sign and timing of the early SIDM impact inferred from collisionless disks, providing a mechanism-based constraint for future hydrodynamic SIDM studies.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.18343",
  "author_total": 1,
  "authors": [
    {
      "name": "Dong-Biao kang"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/e7mrnfgj401ww.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.18343",
  "fulltext_url": null,
  "id": "e7mrnfgj401ww",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.18343",
  "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.GA"
    ],
    [
      "openalex",
      "3103|Galaxies: Formation, Evolution, Phenomena"
    ]
  ],
  "openalex": "W7213494067",
  "pdf_url": "https://arxiv.org/pdf/2609.18343",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-16",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/e7mrnfgj401ww.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:22:01Z",
      "native_id": "2609.18343",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.18343"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "Self-interacting dark matter delays bar growth in an isolated gas-rich galactic disk: torque-resolved numerical evidence",
  "title_text": "Self-interacting dark matter delays bar growth in an isolated gas-rich galactic disk: torque-resolved numerical evidence",
  "type": "preprint",
  "updated_at": "2026-10-30T12:22:01Z",
  "url": "https://research.draconitic.com/paper/e7mrnfgj401ww",
  "venue": "arXiv",
  "versions": []
}