{
  "annotation_id": "332a5f58-0be3-4fea-8630-395cd794ab7e",
  "date_created": "2026-03-02T18:00:31.616000Z",
  "date_modified": "2026-03-02T18:00:31.616000Z",
  "file_hash": "b15cd87460ec5c28946122b6eb3f244a5d7129caac0fa1af900c661b5a23f3ab",
  "private": false,
  "record": {
    "abstract": "Circular orbits of a particle sliding on a frictionless surface of revolution\nabout a vertical axis are unstable below a critical radius if the curvature of\nthe surface satisfies a specified condition. This behavior can be realized in a\nmechanical model, which give a glimpse of the greater complexity of particle\norbits in curved rather than flat spacetime.",
    "arxiv_id": "physics/0006075",
    "authors": [
      "Kirk T. McDonald"
    ],
    "categories": [
      "physics.class-ph"
    ],
    "doi": "10.1119/1.1351152",
    "title": "A mechanical model that exhibits a gravitational critical radius",
    "url": "https://arxiv.org/abs/physics/0006075"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "dfe235c9-89a0-4ba5-92d8-63cb052d0d5b",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}