{
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  "date_created": "2026-03-02T18:01:21.414000Z",
  "date_modified": "2026-03-02T18:01:21.414000Z",
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  "record": {
    "abstract": "A semiclassical Foldy--Wouthuysen transformation of the Dirac equation is\nused to obtain the radiationless Bloch equation for the polarisation density.",
    "arxiv_id": "physics/9901044",
    "authors": [
      "K. Heinemann",
      "D. P. Barber"
    ],
    "categories": [
      "physics.acc-ph",
      "physics.class-ph",
      "quant-ph"
    ],
    "title": "V. The Semiclassical Foldy-Wouthuysen Transformation and the Derivation   of the Bloch Equation for Spin-1/2 Polarised Beams Using Wigner Functions",
    "url": "https://arxiv.org/abs/physics/9901044"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "f24ba4ef-e4c7-4510-a7c0-18b51e28be28",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}