{
  "annotation_id": "821c6920-853d-45fa-8ad0-94460766c665",
  "date_created": "2026-03-02T18:00:01.366000Z",
  "date_modified": "2026-03-02T18:00:01.366000Z",
  "file_hash": "6732f4f03564942984f66cd55949d7887f4c5d722ed8f82c62632ba2cb18b795",
  "private": false,
  "record": {
    "abstract": "The ground states and excited states of the Lipkin model hamiltonian are\ncalculated using a new theoretical approach which has been derived from an\nextended time-dependent Hartree-Fock theory known as the time-dependent\ndensity-matrix theory (TDDM). TDDM enables us to calculate correlated ground\nstates, and its small amplitude limit (STDDM), which is a version of extended\nRPA theories based on a correlated ground state, can be used to calculate\nexcited states. It is found that this TDDM plus STDDM approach gives much\nbetter results for both the ground states and the excited states than the\nHartree-Fock ground state plus RPA approach.",
    "arxiv_id": "nucl-th/0408042",
    "authors": [
      "S. Takahara",
      "M. Tohyama",
      "P. Schuck"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1103/PhysRevC.70.057307",
    "journal_ref": "Phys.Rev. C70 (2004) 057307",
    "title": "Extended RPA with ground-state correlations in a solvable model",
    "url": "https://arxiv.org/abs/nucl-th/0408042"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "eb45bde8-e659-44b7-97b6-fbd68ec1d8b9",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}