{
  "annotation_id": "ec7d3544-82d9-430f-8f05-a56e3386d26b",
  "date_created": "2026-03-02T18:00:42.742000Z",
  "date_modified": "2026-03-02T18:00:42.742000Z",
  "file_hash": "219a4542d1839aa4c547803c28d0cfbaff568cfbdc6986eb11a1d0d2573f5b08",
  "private": false,
  "record": {
    "abstract": "For a multicomponent wave field propagating into a multidimensional\nconversion region, the rays are shown to be helical, in general. For a\nray-based quantity to have a fundamental physical meaning it must be invariant\nunder two groups of transformations: congruence transformations (which shuffle\ncomponents of the multi-component wave field) and canonical transformations\n(which act on the ray phase space). It is shown that for conversion between two\nwaves there is a new invariant not previously discussed: the intrinsic helicity\nof the ray.",
    "arxiv_id": "physics/0303086",
    "authors": [
      "E. R. Tracy",
      "A. N. Kaufman"
    ],
    "categories": [
      "physics.class-ph",
      "physics.gen-ph"
    ],
    "doi": "10.1103/PhysRevLett.91.130402",
    "title": "Ray helicity: a geometric invariant for multi-dimensional resonant wave   conversion",
    "url": "https://arxiv.org/abs/physics/0303086"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "b151e6ba-092f-4c5e-bf3e-a00a9a0e8e6e",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}