{
  "annotation_id": "6cbaa81a-a52c-4af2-96ad-d4537daf12b7",
  "date_created": "2026-03-02T18:00:00.334000Z",
  "date_modified": "2026-03-02T18:00:00.334000Z",
  "file_hash": "a9497dc724fbaefbd8cc98937562c8db1c0ab22b020550d71ad6ebed3dca1879",
  "private": false,
  "record": {
    "abstract": "We solve the Kadanoff-Baym equations for nonequilibrium initial\nconfigurations of the $\\phi^4$-theory in 2+1 dimensions and compare to explicit\nsolutions of generalized transport equations for the same theory. The latter\ntransport equations are derived from the Kadanoff-Baym equation in a first\norder gradient expansion in phase space and explicitly retain the off-shell\ndynamics as inherent in the time-dependent spectral functions. The solutions of\nthese equations compare very well with the exact solutions of the full\nKadanoff-Baym equations with respect to the occupation numbers of the\nindividual modes, the spectral evolution as well as the chemical equilibration\nprocess. Furthermore, the proper equilibrium off-shell distribution is reached\nfor large times contrary to the quasiparticle Boltzmann limit. We additionally\npresent a direct comparison of the solution of the generalized transport\nequations in the Kadanoff-Baym and Botermans-Malfliet form; both solutions are\nfound to agree very well with each other.",
    "arxiv_id": "nucl-th/0401046",
    "authors": [
      "S. Juchem",
      "W. Cassing",
      "C. Greiner"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1016/j.nuclphysa.2004.07.010",
    "journal_ref": "Nucl.Phys. A743 (2004) 92-126",
    "title": "Nonequilibrium Quantum-Field Dynamics and Off-Shell Transport for   $\\phi^4$-theory in 2+1 dimensions",
    "url": "https://arxiv.org/abs/nucl-th/0401046"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "b4b86600-b8e5-4b37-ab20-9ebd4eb5be17",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}