{
  "id": "1508.00985",
  "version": "v1",
  "published": "2015-08-05T06:35:52.000Z",
  "updated": "2015-08-05T06:35:52.000Z",
  "title": "Constraints on scalar coupling to electromagnetism",
  "authors": [
    "Ioannis Antoniou"
  ],
  "comment": "11 pages, 9 figures, 2 tables",
  "categories": [
    "astro-ph.CO"
  ],
  "abstract": "I review experimental and observational constraints on a possible non-minimal coupling of a scalar field to electromagnetism (dilatonic coupling). Such a coupling is motivated from recent quasar spectrum observations that indicate a possible spatial and/or temporal variation of the fine-structure constant. I consider a dilatonic coupling of the form $B_F(\\phi)=1+g\\phi$. The strongest bounds on $g$ come from weak equivalence principle tests which impose the constraint $g<1.6 \\times 10^{-17} GeV^{-1}$. This constraint is strong enough to rule out this class of models as a cause for an observable cosmological variation of the fine structure constant unless chameleon type mechanism is present.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2015-08-05T06:35:52.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "constraint",
      "scalar coupling",
      "electromagnetism",
      "structure constant unless chameleon type",
      "weak equivalence principle tests"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 11,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2015arXiv150800985A",
      "inspire": 1386650
    }
  }
}