{
  "annotation_id": "c095d66d-98b9-45df-ba8f-ed388e790d85",
  "date_created": "2026-03-02T18:00:11.665000Z",
  "date_modified": "2026-03-02T18:00:11.665000Z",
  "file_hash": "3b72ef85f6886eaa8361fc702821f3006d96b6508a1cd0f7821f3dd96a55957d",
  "private": false,
  "record": {
    "abstract": "We have compared exact numerical results for the Lipkin model at finite\ntemperature with Hartree-Fock theory and with the results of including in\naddition the ring diagrams. In the simplest version of the Lipkin model the\nHartree-Fock approach shows a ``phase transition\" which is absent in the exact\nresults. For more realistic cases, Hartree-Fock provides a very good\napproximation and a modest improvement is obtained by adding the ring diagrams.",
    "arxiv_id": "nucl-th/9308001",
    "authors": [
      "S. Y. Tsay Tzeng",
      "P. J. Ellis",
      "T. T. S. Kuo",
      "E. Osnes"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1016/0375-9474(94)90774-9",
    "journal_ref": "Nucl.Phys. A580 (1994) 277-290",
    "title": "Finite Temperature Many-Body Theory with the Lipkin Model",
    "url": "https://arxiv.org/abs/nucl-th/9308001"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "d66d8d89-f184-4d5c-83fa-4d4c90b82e0b",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}