{
  "annotation_id": "afe66d71-4757-41e9-a43c-8d31eae855d6",
  "date_created": "2026-03-02T18:01:18.499000Z",
  "date_modified": "2026-03-02T18:01:18.499000Z",
  "file_hash": "0c5802cdaca6fc129061b606a127067cacf333b4ba00c185f93f833abe9b82ef",
  "private": false,
  "record": {
    "abstract": "If textbook Lorentz invariance is actually a property of the equations\ndescribing a sector of matter above some critical distance scale, several\nsectors of matter with different critical speeds in vacuum can coexist and an\nabsolute rest frame (the vacuum rest frame, possibly related to the local rest\nframe of the expanding Universe) may exist without contradicting the apparent\nLorentz invariance felt by \"ordinary\" particles (particles with critical speed\nin vacuum equal to $c$ , the speed of light). Sectorial Lorentz invariance,\nreflected by the fact that all particles of a given dynamical sector have the\nsame critical speed in vacuum, will then be an expression of a fundamental\nsectorial symmetry (e.g. preonic grand unification or extended supersymmetry)\nprotecting a parameter of the equations of motion. We study the breaking of\nLorentz invariance in such a scenario, with emphasis on mixing between the\n\"ordinary\" sector and a superluminal sector, and discuss with examples the\nconsequences of existing data. The sectorial universality of the value of the\nhigh-energy speed in vacuum, even exact, does not necessarily imply that\nLorentz invariance is not violated and does not by itself exclude the\npossibility to produce superluminal particles at accelerators or to find them\nin experiments devoted to high-energy cosmic rays. Similarly, the stringent\nexperimental bounds on Lorentz symmetry violation at low energy cannot be\nextrapolated to high-energy phenomena. Several basic questions related to\npossible effects of Lorentz symmetry violation are discussed, and potential\nsignatures are examined.",
    "arxiv_id": "physics/9703020",
    "authors": [
      "Luis Gonzalez-Mestres"
    ],
    "categories": [
      "physics.gen-ph"
    ],
    "title": "Lorentz Invariance and Superluminal Particles",
    "url": "https://arxiv.org/abs/physics/9703020"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "8bcd313b-648c-44e0-9000-2d8c974a3a55",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}