{
  "annotation_id": "1e477df6-20ca-4169-816e-d84d5ade1e3c",
  "date_created": "2026-03-02T18:00:46.859000Z",
  "date_modified": "2026-03-02T18:00:46.859000Z",
  "file_hash": "616b75fade820e8cfd7df9d0e7a66fb122031a1dd936d288e0d99bb9d12e18ba",
  "private": false,
  "record": {
    "abstract": "The problem of fundamental units is discussed in the context of achievements\nof both theoretical physics and modern metrology. On one hand, due to\nfascinating accuracy of atomic clocks, the traditional macroscopic standards of\nmetrology (second, metre, kilogram) are giving way to standards based on\nfundamental units of nature: velocity of light $c$ and quantum of action $h$.\nOn the other hand, the poor precision of gravitational constant $G$, which is\nwidely believed to define the ``cube of theories\u0027\u0027 and the units of the future\n``theory of everything\u0027\u0027, does not allow to use $G$ as a fundamental\ndimensional constant in metrology. The electromagnetic units in SI are actually\nbased on concepts of prerelativistic classical electrodynamics such as ether,\nelectric permitivity and magnetic permeability of vacuum. Concluding remarks\nare devoted to terminological confusion which accompanies the progress in basic\nphysics and metrology.",
    "arxiv_id": "physics/0310069",
    "authors": [
      "L. B. Okun"
    ],
    "categories": [
      "physics.ed-ph",
      "physics.gen-ph"
    ],
    "doi": "10.1007/b13178",
    "title": "Fundamental units: physics and metrology",
    "url": "https://arxiv.org/abs/physics/0310069"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "2f5abf95-8cf9-47e1-92cf-8463884c4d5d",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}