{
  "annotation_id": "676bd3a9-eb17-46bb-82ed-c0ac678a1a1b",
  "date_created": "2026-03-02T18:00:52.608000Z",
  "date_modified": "2026-03-02T18:00:52.608000Z",
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  "record": {
    "abstract": "Propagation of electromagnetic plane waves in some directions in\ngravitationally affected vacuum over limited ranges of spacetime can be such\nthat the phase velocity vector casts a negative projection on the time-averaged\nPoynting vector. This conclusion suggests, inter alia, gravitationally assisted\nnegative refraction by vacuum.",
    "arxiv_id": "physics/0408021",
    "authors": [
      "Akhlesh Lakhtakia",
      "Tom G. Mackay"
    ],
    "categories": [
      "physics.optics",
      "astro-ph",
      "physics.space-ph"
    ],
    "doi": "10.1088/0305-4470/37/42/L02",
    "journal_ref": "J.Phys. A37 (2004) L505-L510",
    "title": "Towards gravitationally assisted negative refraction of light by vacuum",
    "url": "https://arxiv.org/abs/physics/0408021"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "db4e0ac5-9ff4-448f-8566-e7c72aa2889b",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}