{
  "id": "quant-ph/0111060",
  "version": "v2",
  "published": "2001-11-09T23:13:02.000Z",
  "updated": "2003-02-28T17:05:28.000Z",
  "title": "Localization and Causality for a free particle",
  "authors": [
    "N. Barat",
    "J. C. Kimball"
  ],
  "comment": "9 pages,no figures,new section added",
  "journal": "Physics Letters A vol.308(2003)110-115",
  "doi": "10.1016/S0375-9601(02)01806-6",
  "categories": [
    "quant-ph"
  ],
  "abstract": "Theorems (most notably by Hegerfeldt) prove that an initially localized particle whose time evolution is determined by a positive Hamiltonian will violate causality. We argue that this apparent paradox is resolved for a free particle described by either the Dirac equation or the Klein-Gordon equation because such a particle cannot be localized in the sense required by the theorems.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2003-02-28T17:05:28.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "free particle",
      "localization",
      "time evolution",
      "violate causality",
      "apparent paradox"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 9,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}