{
  "annotation_id": "c105d7be-083b-4ede-9dac-661a56745d7e",
  "date_created": "2026-03-02T18:00:39.489000Z",
  "date_modified": "2026-03-02T18:00:39.489000Z",
  "file_hash": "dbf0d5d53856a55b2919b21622143ee391cfd7fc51495cd567f6d948144b084f",
  "private": false,
  "record": {
    "abstract": "To gain some insight into the structure and physical significance of the\nmultiple solutions to the coupled-cluster doubles (CCD) equations corresponding\nto the Pariser-Parr-Pople (PPP) model of cyclic polyenes, complete solutions to\nthe CCD equations for the A^{-}_{1g} states of benzene are obtained by means of\nthe homotopy method. By varying the value of the resonance integral beta from\n-5.0 eV to -0.5 eV, we cover the so-called weakly, moderately, and strongly\ncorrelated regimes of the model. For each value of beta 230 CCD solutions are\nobtained. It turned out, however, that only for a few solutions a\ncorrespondence with some physical states can be established. It has also been\ndemonstrated that, unlike for the standard methods of solving CCD equations,\nsome of the multiple solutions to the CCD equations can be attained by means of\nthe iterative process based on Pulay\u0027s direct inversion in the iterative\nsubspace (DIIS) approach.",
    "arxiv_id": "physics/0207086",
    "authors": [
      "Rafa\u0142 Podeszwa",
      "Leszek Z. Stolarczyk",
      "Karol Jankowski",
      "Krzysztof Rubiniec"
    ],
    "categories": [
      "physics.chem-ph"
    ],
    "title": "Multiple solutions of CCD equations for PPP model of benzene",
    "url": "https://arxiv.org/abs/physics/0207086"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "9e91a5a2-6aa7-4556-bfdf-c563e650ec1d",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}