{
  "annotation_id": "e78506d0-b428-457e-ad26-04206aecf0d8",
  "date_created": "2026-03-02T18:00:46.543000Z",
  "date_modified": "2026-03-02T18:00:46.543000Z",
  "file_hash": "debe53f21907b10be74c9a5ea1ffd49ecadf8a80680a125972ddffbe00ccd4cd",
  "private": false,
  "record": {
    "abstract": "Generic wave dislocations (phase singularities, optical vortices) in three\ndimensions have anisotropic local structure, which is analysed, with emphasis\non the twist of surfaces of equal phase along the singular line, and the\nrotation of the local anisotropy ellipse (twirl). Various measures of twist and\ntwirl are compared in specific examples, and a theorem is found relating the\n(quantised) topological twist and twirl for a closed dislocation loop with the\nanisotropy C line index threading the loop.",
    "arxiv_id": "physics/0309069",
    "authors": [
      "M. R. Dennis"
    ],
    "categories": [
      "physics.optics"
    ],
    "doi": "10.1088/1464-4258/6/5/011",
    "journal_ref": "J Opt A: Pure Appl. Opt. 6 (2004) S202-8",
    "title": "Local phase structure of wave dislocation lines: twist and twirl",
    "url": "https://arxiv.org/abs/physics/0309069"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "e083a9f7-c7dd-4225-bbe6-d7edf9ba017b",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}