{
  "annotation_id": "55d3023c-0732-4c03-8bac-f24c28746a19",
  "date_created": "2026-03-02T18:00:11.727000Z",
  "date_modified": "2026-03-02T18:00:11.727000Z",
  "file_hash": "6765668997097e7e68578c4628bc8af9fb06f123b6e0931618d0f9158137746a",
  "private": false,
  "record": {
    "abstract": "Density dependent parametrization models of the nucleon-meson effective\ncouplings, including the isovector scalar \\delta-field, are applied to\nasymmetric nuclear matter. The nuclear equation of state and the neutron star\nproperties are studied in an effective Lagrangian density approach, using the\nrelativistic mean field hadron theory. It is known that the introduction of a\n\\delta-meson in the constant coupling scheme leads to an increase of the\nsymmetry energy at high density and so to larger neutron star masses, in a pure\nnucleon-lepton scheme. We use here a more microscopic density dependent model\nof the nucleon-meson couplings to study the properties of neutron star matter\nand to re-examine the \\delta-field effects in asymmetric nuclear matter. Our\ncalculations show that, due to the increase of the effective \\delta coupling at\nhigh density, with density dependent couplings the neutron star masses in fact\ncan be even reduced.",
    "arxiv_id": "nucl-th/0702064",
    "authors": [
      "B. Liu",
      "M. Di Toro",
      "V. Greco",
      "C. W. Shen",
      "E. G. Zhao",
      "B. X. Sun"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1103/PhysRevC.75.048801",
    "journal_ref": "Phys.Rev.C75:048801,2007",
    "title": "Application of density dependent parametrization models to asymmetric   nuclear matter",
    "url": "https://arxiv.org/abs/nucl-th/0702064"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "45c2e51f-a247-44a4-9d07-4391ec81ccd3",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}