{
  "annotation_id": "8ccc8cc1-6917-49d5-99b9-1e371f634efa",
  "date_created": "2026-03-02T18:00:08.069000Z",
  "date_modified": "2026-03-02T18:00:08.069000Z",
  "file_hash": "885d6aaab5a8aad7071837129bed9c02df61bc372560ca1a8a9f6617e4a7ebfb",
  "private": false,
  "record": {
    "abstract": "A new method for describing the two-level pairing model in a many-fermion\nsystem is presented. Basic idea comes from the Schwinger boson representation\nfor the su(2) cross su(2)-algebra, in which four kinds of boson operators\ngovern the dynamics. It is well known that in the original fermion space, it is\nalmost impossible to introduce any trial state for the variation except the BCS\nstate in the framework of the mean field approximation. However, in the\nSchwinger boson representation, various trial states can be defined on the\ncondition that the mean field approximation is useful. In these states, the\nmixed-mode coherent state is mainly discussed in this paper.",
    "arxiv_id": "nucl-th/0601087",
    "authors": [
      "C. Providencia",
      "J. da Providencia",
      "Y. Tsue",
      "M. Yamamura"
    ],
    "categories": [
      "nucl-th"
    ],
    "title": "A New Boson Realization of Two-Level Pairing Model in Many-Fermion   System and its Classical Counterpart",
    "url": "https://arxiv.org/abs/nucl-th/0601087"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "4eeea000-5fdb-49fc-af4c-f2ba5864d651",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}