{
  "abstract": "The poorly constrained density dependence of the nuclear symmetry energy introduces significant uncertainties in the equation of state (EOS) of dense nuclear matter and, consequently, in neutron-star properties. We systematically investigate how uncertainties in the symmetry energy $E_{\\rm sym}$ and its slope $L$ at saturation density $n_0$ affect NS properties within the relativistic mean-field (RMF) framework, including the effects of nonlinear $σ$-$δ$ coupling and possible admixture of dark matter(DM) . For fixed $E_{\\rm sym}(n_0)$ and $L(n_0)$, we find that the $σ$-$δ$ coupling with $g_{σδ}=-0.004$ induces an abnormal softening of the EOS, which simultaneously increasing the maximum NS mass and reducing the stellar radius and tidal deformability. A similar behavior is found in the presence of DM with Fermi momentum $k_F^{\\rm DM}=50~\\mathrm{MeV}$ at $E_{\\rm sym}(n_0)=36~\\mathrm{MeV}$. In this case, the RMF EOS satisfies the tidal-deformability constraint from GW170817. We further find that the surface curvature of NSs is strongly correlated with the stiffness of $E_{\\rm sym}$, with softer symmetry energy corresponding to larger surface curvature. Our results also indicate that the behavior of $E_{\\rm sym}$ around $n_0$ is mainly governed by isoscalar rather than isovector parameters.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.08628",
  "author_total": 4,
  "authors": [
    {
      "name": "Zhaohui Feng"
    },
    {
      "name": "Xiaoxuan Zhai"
    },
    {
      "name": "Shuangxuan Chen"
    },
    {
      "name": "Defu Hou"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/769f4jey2eeqe.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.08628",
  "fulltext_url": null,
  "id": "769f4jey2eeqe",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.08628",
  "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",
      "hep-ph"
    ],
    [
      "arxiv",
      "nucl-th"
    ],
    [
      "openalex",
      "3103|Pulsars and Gravitational Waves Research"
    ]
  ],
  "openalex": "W7212064375",
  "pdf_url": "https://arxiv.org/pdf/2609.08628",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-08",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/769f4jey2eeqe.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:19:52Z",
      "native_id": "2609.08628",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.08628"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    },
    {
      "field": "physics",
      "origin": "arxiv:nucl-th",
      "subfield": "nuclear"
    }
  ],
  "title": "The Interplay of Symmetry Energy Uncertainties, Nonlinear $σ-δ$ Coupling, and Dark Matter in Neutron Star Macroscopic Properties",
  "title_text": "The Interplay of Symmetry Energy Uncertainties, Nonlinear σ−δ Coupling, and Dark Matter in Neutron Star Macroscopic Properties",
  "type": "preprint",
  "updated_at": "2026-10-30T12:19:52Z",
  "url": "https://research.draconitic.com/paper/769f4jey2eeqe",
  "venue": "arXiv",
  "versions": []
}