{
  "annotation_id": "705be323-a087-4639-ae09-922ad2f9acbb",
  "date_created": "2026-03-02T18:02:16.542000Z",
  "date_modified": "2026-03-02T18:02:16.542000Z",
  "file_hash": "dfe3a5453f122f2109bd880321ce5cbaf355ad721adf57f687c6fb30c310a402",
  "private": false,
  "record": {
    "abstract": "In this Comment we show that the temperature-dependent effective Hamiltonian\nderived by Reslen {\\it et al} [Europhys. Lett., {\\bf 69} (2005) 8] or that one\nby Liberti and Zaffino [arXiv:cond-mat/0503742] for the Dicke model cannot be\ncorrect for any temperature. They both violate a rigorous result. The former is\ncorrect only in the quantum (zero-temperature) limit while the last one only in\nthe classical (infinite temperature) limit. The fact that the Dicke model\nbelongs to the universality class of the infinitely coordinated\ntransverse-field XY model is known for more then 30 years.",
    "arxiv_id": "quant-ph/0506207",
    "authors": [
      "J. G. Brankov",
      "N. S. Tonchev",
      "V. A. Zagrebnov"
    ],
    "categories": [
      "quant-ph"
    ],
    "title": "Comment on equivalence between quantum phase transition phenomena in   radiation-matter and magnetic systems",
    "url": "https://arxiv.org/abs/quant-ph/0506207"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "0583f76e-dd64-4361-9216-30bf556aa0a2",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}