{
  "abstract": "We investigate the equilibrium structure and stability against radial oscillations of a variety of two-fluid compact objects containing ordinary baryonic matter admixed with cold dark matter coupled through the background spacetime. For the ordinary fluid, we employ a QCD equation of state compatible with chiral effective field theory at nuclear densities (supplemented by the BPS and Negele-Vautherin models at extremely low densities) and with perturbative QCD in the high-density regime while also satisfying also current astrophysical data. For the dark fluid, we assume self-interacting fermionic matter with particle masses of $m_f=$ 2, 5, 10, and 100 GeV and two self-interaction strengths of $y=0.1$ and $10^3$. By scanning a large range of central pressures for both fluids, we identify the presence of dark compact planets, dark white dwarfs, dark neutron stars and the so-called dark oysters. Importantly, these objects are not only in two-fluid hydrostatic equilibrium, but they are also stable against two-fluid radial oscillations. We find that the relative representation of each class in the radially stable sample is strongly sensitive to the combinations of $m_f$ and $y$, with some combinations entirely suppressing some of these object classes within the sampled domain while favoring others. In addition to these classes, strong self-repulsion supports stable, dark-matter-dominated branches with compact ordinary-matter cores and extended dark halos, approaching the self-interacting fermion-star limit. Finally, we calculate the gravitational redshift at the ordinary-matter surface, $z_{\\rm OM}$, including the contribution of extended dark-matter halos for which we found radially stable configurations with $z_{\\rm OM}>2$.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.41082",
  "author_total": 3,
  "authors": [
    {
      "name": "José C. Jiménez"
    },
    {
      "name": "Oscar Pastor"
    },
    {
      "name": "Laura Tolos"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/7y43523ngr7e5.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.41082",
  "fulltext_url": null,
  "id": "7y43523ngr7e5",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.41082",
  "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.HE"
    ],
    [
      "arxiv",
      "astro-ph.SR"
    ],
    [
      "arxiv",
      "gr-qc"
    ],
    [
      "arxiv",
      "hep-ph"
    ],
    [
      "arxiv",
      "nucl-th"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2610.41082",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-29",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/7y43523ngr7e5.ris",
  "sources": [
    {
      "first_seen": "2026-11-02T12:21:15Z",
      "native_id": "2610.41082",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.41082"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.HE",
      "subfield": "high-energy-astrophysics"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.SR",
      "subfield": "stellar"
    },
    {
      "field": "physics",
      "origin": "arxiv:gr-qc",
      "subfield": "gravitation"
    },
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    },
    {
      "field": "physics",
      "origin": "arxiv:nucl-th",
      "subfield": "nuclear"
    }
  ],
  "title": "Two-Fluid Radial Stability of Dark-Matter-Admixed Compact Objects: Dark Compact Planets, Dark White Dwarfs, Dark Neutron Stars, and Dark Oysters",
  "title_text": "Two-Fluid Radial Stability of Dark-Matter-Admixed Compact Objects: Dark Compact Planets, Dark White Dwarfs, Dark Neutron Stars, and Dark Oysters",
  "type": "preprint",
  "updated_at": "2026-11-04T15:20:51Z",
  "url": "https://research.draconitic.com/paper/7y43523ngr7e5",
  "venue": "arXiv",
  "versions": []
}