{
  "annotation_id": "06cd3728-21b8-48d2-9a8c-eaa6ffa209cd",
  "date_created": "2026-03-02T18:01:14.883000Z",
  "date_modified": "2026-03-02T18:01:14.883000Z",
  "file_hash": "4d21c9f8321434d1e12307fcb9c471aade15c176a4eed0580c992019423a4d3d",
  "private": false,
  "record": {
    "abstract": "M.W.Evans tried to relate the electromagnetic field strength to the torsion\nof a Riemann-Cartan spacetime. We show that this ansatz is untenable for at\nleast two reasons: (i) Geometry: Torsion is related to the (external)\ntranslation group and cannot be linked to an internal group, like the U(1)\ngroup of electrodynamics. (ii) Electrodynamics: The electromagnetic field\nstrength as a 2-form carries 6 independent components, whereas Evans\u0027\nelectromagnetic construct F^\\a is a vector-valued 2-form with 24 independent\ncomponents. This doesn\u0027t match. One of these reasons is already enough to\ndisprove the ansatz of Evans.",
    "arxiv_id": "physics/0612026",
    "authors": [
      "Friedrich W. Hehl"
    ],
    "categories": [
      "physics.class-ph",
      "gr-qc",
      "physics.gen-ph"
    ],
    "title": "A remark on an ansatz by M.W. Evans and the so-called   Einstein-Cartan-Evans unified field theory",
    "url": "https://arxiv.org/abs/physics/0612026"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "0bc270ed-9a3f-4c44-8e2b-023d7e8ce530",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}