{
  "annotation_id": "9a17999d-a26d-41a8-a0b2-5a27f9b5ccf3",
  "date_created": "2026-03-02T18:01:07.410000Z",
  "date_modified": "2026-03-02T18:01:07.410000Z",
  "file_hash": "16d2f05de9cffcd4cddc071edb2dcc62a749fe7a0ee0d94826e678ab8e3283c5",
  "private": false,
  "record": {
    "abstract": "Equations of motions and energy-momentum density tensors are obtained for a\ndispersive and dissipative medium sustaining electric and magnetic\npolarizations, using Lagrangian formalisms. A previous work on the subject by\nthe authors has been simplified by reduction in the Lagrangian of the number of\nindependent vector fields, with which the sink modes (associated with the\ndissipation) interact. The paper also formulates the dynamics of the\nelectromagnetic field in the medium in a covariant (relativistic) manner. We\ndiscuss (and compare) the results, especially from the point of view of the\npositivity of the energy density.",
    "arxiv_id": "physics/0605060",
    "authors": [
      "Asher Yahalom",
      "Robert Englman",
      "Yosef Pinhasi"
    ],
    "categories": [
      "physics.optics",
      "physics.gen-ph"
    ],
    "title": "Covariant Formulation of the Dynamics in a Dissipative Dielectric   Obtained from a Simplified Lagrangian",
    "url": "https://arxiv.org/abs/physics/0605060"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "66d777f9-22d2-46f6-bf39-3b1778b82da6",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}