{
  "annotation_id": "1c0b96a4-5962-4ec1-ab88-0dfc9f466cfc",
  "date_created": "2026-03-02T18:01:00.528000Z",
  "date_modified": "2026-03-02T18:01:00.528000Z",
  "file_hash": "6075caa00eda1f7d555bd583bb93b05f261137438573aa02fd8f05a7af2576a1",
  "private": false,
  "record": {
    "abstract": "We use the classical fields approximation to study a translational flow of\nthe condensate with respect to the thermal cloud in a weakly interacting Bose\ngas. We study both, subcritical and supercritical relative velocity cases and\nanalyze in detail a state of stationary flow which is reached in the dynamics.\nThis state corresponds to the thermal equilibrium, which is characterized by\nthe relative velocity of the condensate and the thermal cloud. The\nsuperfluidity manifests itself in the existence of many thermal equilibria\nvarying in (the value of this velocity) the relative velocity between the\ncondensate and the thermal cloud. We pay a particular attention to excitation\nspectra in a phonon as well as in a particle regime. Finally, we introduce a\nmeasure of the amount of the superfluid fraction in a weakly interacting Bose\ngas, allowing for the precise distinction between the superfluid and the\ncondensed fractions in a single and consistent framework.",
    "arxiv_id": "physics/0508082",
    "authors": [
      "Lukasz Zawitkowski",
      "Mariusz Gajda",
      "Kazimierz Rzazewski"
    ],
    "categories": [
      "physics.atom-ph"
    ],
    "doi": "10.1103/PhysRevA.74.043601",
    "title": "Superfluidity of the BEC at finite temperature",
    "url": "https://arxiv.org/abs/physics/0508082"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "ccb67007-846b-4e0c-8d23-4e1d93d59701",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}