{
  "annotation_id": "7ee6c309-317d-4dbf-b6af-99d65d111181",
  "date_created": "2026-03-02T18:01:21.618000Z",
  "date_modified": "2026-03-02T18:01:21.618000Z",
  "file_hash": "1974ce8377aa26faa116b112e9209d6116f0d546f8743b1291840684d21d6b6d",
  "private": false,
  "record": {
    "abstract": "In this paper we analyze the physical meaning of sub- and superluminal\nsoliton-like solutions (as the X-waves) of the relativistic wave equations and\nof some non-trivial solutions of the free Schr\\\"odinger equation for which the\nconcepts of phase and group velocities have a different meaning than in the\ncase of plane wave solutions. If we accept the strict validity of the principle\nof relativity, such solutions describe objects of two essentially different\nnatures: carrying energy wave packets and inertia-free properly phase\nvibrations. Speeds of the first-type objects can exceed the plane wave velocity\n$c_*$ only inside media and are always less than the vacuum light speed $c$.\nParticularly, very fast sound pulses with speeds $c_* \u003c v \u003c c$ have already\nbeen launched. The second-type objects are incapable of carrying energy and\ninformation but have superluminal speed. If we admit the possibility of a\nbreakdown of Lorentz invariance, pulses described, for example, by superluminal\nsolutions of the Maxwell equations can be generated. Only experiment will give\nthe final answer.",
    "arxiv_id": "physics/9710025",
    "authors": [
      "V. S. Barashenkov",
      "W. A. Rodrigues Jr"
    ],
    "categories": [
      "physics.class-ph"
    ],
    "title": "Launching of Non-Dispersive Superluminal Beams",
    "url": "https://arxiv.org/abs/physics/9710025"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "517e67b5-181c-477e-96ef-3c7332ba1d03",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}