{
  "annotation_id": "8e32ce5f-1e57-46c1-a4a7-d5380b4446f3",
  "date_created": "2026-03-02T18:00:18.474000Z",
  "date_modified": "2026-03-02T18:00:18.474000Z",
  "file_hash": "492bb112524bfb9dc994dbf576e95cfdd05d504f4aed37f22f05c3d0da2bd23c",
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  "record": {
    "abstract": "The nonrelativistic Ward-Takahashi identity, a consequence of local gauge\ninvariance in quantum mechanics, shows the necessity of exchange current\ncontributions in case of nonlocal and/or isospin-dependent potentials. It also\nimplies Siegert\u0027s hypothesis: in the nonrelativistic limit, two-body charge\ndensities identically vanish. Neither current conservation, which follows from\nglobal gauge invariance, nor the constraints of (lowest order) relativity are\nsufficient to arrive at this result. Furthermore, a low-energy theorem for\nexchange contributions is established.",
    "arxiv_id": "nucl-th/9608063",
    "authors": [
      "H. W. L. Naus"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1103/PhysRevC.55.1580",
    "journal_ref": "Phys.Rev.C55:1580-1582,1997",
    "title": "Local gauge invariance implies Siegert\u0027s hypothesis",
    "url": "https://arxiv.org/abs/nucl-th/9608063"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "6b547471-3da1-4f71-88d2-83c98589481b",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}