{
  "annotation_id": "0f270b3d-c715-4337-8696-d8e4ccad935a",
  "date_created": "2026-03-02T18:00:01.534000Z",
  "date_modified": "2026-03-02T18:00:01.534000Z",
  "file_hash": "6fb2943bf7dc9193e00c025d2f4cb9f578906fb367aaed4426aa93f0fdb35d54",
  "private": false,
  "record": {
    "abstract": "To elucidate the mechanism by which chaos is generated in the shell model, we\ncompare three random-matrix ensembles: the Gaussian orthogonal ensemble,\nFrench\u0027s two-body embedded ensemble, and the two-body random ensemble (TBRE) of\nthe shell model. Of these, the last two take account of the two-body nature of\nthe residual interaction, and only the last, of the existence of conserved\nquantum numbers like spin, isospin, and parity. While the number of independent\nrandom variables decreases drastically as we follow this sequence, the\ncomplexity of the (fixed) matrices which support the random variables,\nincreases even more. In that sense we can say that in the TBRE, chaos is\nlargely due to the existence of (an incomplete set of) symmetries.",
    "arxiv_id": "nucl-th/0403041",
    "authors": [
      "T. Papenbrock",
      "H. A. Weidenmueller"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1016/j.nuclphysa.2005.04.018",
    "journal_ref": "Nucl. Phys. A 757, 422 (2005)",
    "title": "Origin of chaos in the spherical nuclear shell model: role of symmetries",
    "url": "https://arxiv.org/abs/nucl-th/0403041"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "567364c6-44cf-46ab-95e1-ebb0ff2bc7c3",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}