{
  "annotation_id": "f14dc047-aaf6-4d65-b824-3fe52ff550f7",
  "date_created": "2026-03-02T18:00:53.237000Z",
  "date_modified": "2026-03-02T18:00:53.237000Z",
  "file_hash": "1db5088c91cffa4bf4d6a850c71d789cd4b03ed455499ffb1a0ac46d39c6b956",
  "private": false,
  "record": {
    "abstract": "Gravitation has interesting consequences for plane wave propagation in a\nvacuum. The propagation of plane waves with phase velocity directed opposite to\nthe the time-averaged Poynting vector is investigated for a generally curved\nspacetime. Conditions for such negative-phase-velocity (NPV) propagation are\nestablished in terms of the metric components for general and special cases.\nThe negative energy density implications of NPV propagation are discussed.",
    "arxiv_id": "physics/0410265",
    "authors": [
      "Tom G. Mackay",
      "Akhlesh Lakhtakia",
      "Sandi Setiawan"
    ],
    "categories": [
      "physics.space-ph"
    ],
    "doi": "10.1088/1367-2630/7/1/075",
    "journal_ref": "New J.Phys. 7 (2005) 75",
    "title": "Gravitation and Electromagnetic Wave Propagation with Negative Phase   Velocity",
    "url": "https://arxiv.org/abs/physics/0410265"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "16041551-9b0a-4610-89f6-f031320aa66c",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}