{
  "annotation_id": "6dc837bc-2f23-4aef-a5f2-07a143c885b0",
  "date_created": "2026-03-02T18:00:08.646000Z",
  "date_modified": "2026-03-02T18:00:08.646000Z",
  "file_hash": "d44d01bc289fe2fa80cfcc39ee3e76bc419a15da74cebda0cab821e7ab4a04cb",
  "private": false,
  "record": {
    "abstract": "The symmetry energy of nucleonic matter is usually assumed to be quadratic in\nthe isospin density. While this may be justified at sub-saturation densities,\nthere is no need to enforce this restriction at super-saturation densities. The\npresence of a quartic term can strongly modify the critical density for the\ndirect Urca process which leads to faster cooling of neutron stars. Neutron\nstar cooling predictions which lie below the observational data can, for some\nequations of state, be repaired with a quartic term which effectively turns off\nthe direct Urca process.",
    "arxiv_id": "nucl-th/0607040",
    "authors": [
      "Andrew W. Steiner"
    ],
    "categories": [
      "nucl-th",
      "astro-ph"
    ],
    "doi": "10.1103/PhysRevC.74.045808",
    "journal_ref": "Phys.Rev. C74 (2006) 045808",
    "title": "The High-Density Symmetry Energy and Direct Urca",
    "url": "https://arxiv.org/abs/nucl-th/0607040"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "50f3f56f-db30-44c7-b9bf-10b4ddf85577",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}