{
  "abstract": "We investigate neutron stars admixed with repulsively self-interacting bosonic dark matter (DM) using current multi-messenger observations. The dark component is modeled as a complex scalar field coupled to baryonic matter only through gravity, allowing dark-core and dark-halo configurations. To quantify baryonic equation-of-state (EOS) uncertainties, we combine a three-dimensional scan over $(m_χ,λ,F_χ)$ with 27 DDME2-based covariant density-functional EOSs spanning $L_{\\rm sym}=30,50,70$ MeV and $-600\\le Q_{\\rm sat}\\le 1000$ MeV. The models are confronted in a Bayesian framework with NICER mass--radius measurements from the Amsterdam and Maryland/Illinois analyses and the GW170817 tidal-deformability constraint. After Bayesian evidence weighting over the EOS ensemble, the EOS-relevant dark-sector scale $μ_χ\\equiv m_χ/λ^{1/4}$ is localized around 250 MeV for both NICER data sets. In the $(m_χ,λ)$ parameterization, the marginalized boson-mass posterior peaks at $m_χ\\simeq300$--$330$ MeV, while $λ$ remains broadly distributed. Since the bosonic EOS depends on $m_χ$ and $λ$ only through $μ_χ$, their separate marginals are conditional on the adopted independent priors. The inferred DM fraction is more data-set dependent, with posterior modes near 4% for Maryland/Illinois and 12% for Amsterdam. Bosonic DM also shifts the inferred $Q_{\\rm sat}$ from negative toward intermediate and positive values, whereas the response of $L_{\\rm sym}$ is weaker. This indicates a model-dependent trade-off between DM-induced compactification and the high-density stiffness of baryonic matter. These constraints remain conditional on the selected EOS family and the assumption of a common effective $F_χ$ for all sources.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.38055",
  "author_total": 3,
  "authors": [
    {
      "name": "Davood Rafiei Karkevandi"
    },
    {
      "name": "Alexander Ayriyan"
    },
    {
      "name": "Armen Sedrakian"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/9t84rrfcfxgrk.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.38055",
  "fulltext_url": null,
  "id": "9t84rrfcfxgrk",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.38055",
  "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",
      "nucl-th"
    ],
    [
      "openalex",
      "3103|Pulsars and Gravitational Waves Research"
    ]
  ],
  "openalex": "W7214961591",
  "pdf_url": "https://arxiv.org/pdf/2609.38055",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-29",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/9t84rrfcfxgrk.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:25:31Z",
      "native_id": "2609.38055",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.38055"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.HE",
      "subfield": "high-energy-astrophysics"
    },
    {
      "field": "physics",
      "origin": "arxiv:nucl-th",
      "subfield": "nuclear"
    }
  ],
  "title": "Bayesian Constraints on Bosonic Dark Matter in Neutron Stars within a Covariant Density-Functional Equation-of-State Ensemble",
  "title_text": "Bayesian Constraints on Bosonic Dark Matter in Neutron Stars within a Covariant Density-Functional Equation-of-State Ensemble",
  "type": "preprint",
  "updated_at": "2026-10-30T12:25:31Z",
  "url": "https://research.draconitic.com/paper/9t84rrfcfxgrk",
  "venue": "arXiv",
  "versions": []
}