{
  "annotation_id": "60343411-2ab8-47ed-80a0-89319894f51d",
  "date_created": "2026-03-02T18:00:21.974000Z",
  "date_modified": "2026-03-02T18:00:21.974000Z",
  "file_hash": "2dd5fd6067f8d2e855bb82d4716d3fc529918f8c98bb5fea670c334a6c1a7254",
  "private": false,
  "record": {
    "abstract": "The optimized $\\delta$-expansion is a nonperturbative approach for field\ntheoretic models which combines the techniques of perturbation theory and the\nvariational principle. This technique is discussed in the $\\lambda \\phi^4$\nmodel and then implemented in the Walecka model for the equation of state of\nnuclear matter. The results obtained with the $\\delta$ expansion are compared\nwith those obtained with the traditional mean field, relativistic Hartree and\nHartree-Fock approximations.",
    "arxiv_id": "nucl-th/9709049",
    "authors": [
      "G. Krein",
      "R. S. Marques de Carvalho",
      "D. P. Menezes",
      "M. Nielsen",
      "M. B. Pinto"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1007/s100500050030",
    "journal_ref": "Eur.Phys.J. A1 (1998) 45-53",
    "title": "Optimized delta expansion for relativistic nuclear models",
    "url": "https://arxiv.org/abs/nucl-th/9709049"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "0f8bc8f2-a3d5-42e1-896e-af5722d19097",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}