{
  "annotation_id": "8e5309ee-e774-4c01-891d-41d6a567b5ef",
  "date_created": "2026-03-02T18:00:25.305000Z",
  "date_modified": "2026-03-02T18:00:25.305000Z",
  "file_hash": "856306b4b3e7201ed396d1f6c74ddacd33f8e6483ffe01526ffa54583b06afb9",
  "private": false,
  "record": {
    "abstract": "The recent progress on the study of the collective excitation in relativistic\nnuclear matter is reviewed. The collective excitation modes are derived by\nmeson propagators in nuclear matter. The mesons we study are $\\sigma, \\omega,\n\\gamma$ and $\\pi$ mesons. For pion, we derived not only the relativistic\nparticle - hole, delta - hole excitations but also antiparticle excitations,\nsuch as particle - antiparticle, antidelta - particle, delta - antiparticle\nexcitations. By calculating the dispersion relation and the spin - isospin\ndependent response function, the effects of all these excitation are studied.",
    "arxiv_id": "nucl-th/9901085",
    "authors": [
      "Liang-gang Liu"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1088/0253-6102/32/4/567",
    "journal_ref": "Commun.Theor.Phys.32:567-574,1999",
    "title": "The Collective Excitation Spectra of $\\sigma, \\omega$ and $\\pi$ Mesons   in Nuclear Matter",
    "url": "https://arxiv.org/abs/nucl-th/9901085"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "8f53a2b0-fc5c-43ee-a16e-c86d55b778ae",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}