{
  "annotation_id": "6edb23e0-5097-4a46-bbac-c12528b9c453",
  "date_created": "2026-03-02T18:00:46.220000Z",
  "date_modified": "2026-03-02T18:00:46.220000Z",
  "file_hash": "1c841b27d20d562e01d166c16ee8806c544d017e6281182af29fbcea0f942399",
  "private": false,
  "record": {
    "abstract": "We present a general proof based on Kramers-Kronig relations that, in a\nnormal or anomalous dispersive linear medium, any (discontinuitynonanalytic\ndisturbance) in an electromagnetic pulse can not propagate faster than the\nphase velocity, $c$. Consequently the information carried by the discontinuity\n(nonanalytical disturbance) can not be transmitted superluminally.",
    "arxiv_id": "physics/0310026",
    "authors": [
      "Shi-Yao Zhu",
      "Ya-Ping Yang",
      "Li-Gang Wang",
      "Nian-Hua Liu",
      "M. Suhail Zubairy"
    ],
    "categories": [
      "physics.class-ph"
    ],
    "title": "Propagation of Fronts and Information in Dispersive Media",
    "url": "https://arxiv.org/abs/physics/0310026"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "fd6f21ce-880a-4384-95cf-504c7b46bb3c",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}