{
  "annotation_id": "254afc2a-427c-48ac-a34c-d4a812f9dbfb",
  "date_created": "2026-03-02T18:02:48.609000Z",
  "date_modified": "2026-03-02T18:02:48.609000Z",
  "file_hash": "98a119864eb358a0cff9a4912c84172d430ca6d651764145518387c4710d9f9e",
  "private": false,
  "record": {
    "abstract": "For an isolated macrosystem classical state parameters $\\zeta(t)$ are\nintroduced inside a quantum mechanical treatment. By a suitable mathematical\nrepresentation of the actual preparation procedure in the time interval\n$[T,t_0]$ a statistical operator is constructed as a solution of the Liouville\nvon Neumann equation, exhibiting at time $t$ the state parameters $\\zeta(t\u0027)$,\n$t_0\\leq t\u0027 \\leq t$, and {\\it preparation parameters} related to times $T \\leq\nt\u0027\\leq t_0$. Relation with Zubarev\u0027s non-equilibrium statistical operator is\ndiscussed. A mechanism for memory loss is investigated and time evolution by a\nsemigroup is obtained for a restricted set of relevant observables, slowly\nvarying on a suitable time scale.",
    "arxiv_id": "quant-ph/9910042",
    "authors": [
      "L. Lanz",
      "O. Melsheimer",
      "B. Vacchini"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1016/S0034-4877(01)80023-9",
    "journal_ref": "Rep. Math. Phys. 46 (2000) 191-202",
    "title": "Description of isolated macroscopic systems inside quantum mechanics",
    "url": "https://arxiv.org/abs/quant-ph/9910042"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "01f3a26b-d765-4587-beae-67495e755f4d",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}