{
  "id": "0903.4171",
  "version": "v3",
  "published": "2009-03-24T23:32:50.000Z",
  "updated": "2009-08-19T22:41:45.000Z",
  "title": "Lenses in the forest: cross-correlation of the Lyman-alpha flux with CMB lensing",
  "authors": [
    "Alberto Vallinotto",
    "Sudeep Das",
    "David N. Spergel",
    "Matteo Viel"
  ],
  "comment": "5 pages, 4 figures, matches published version",
  "journal": "Phys.Rev.Lett.103:091304,2009",
  "doi": "10.1103/PhysRevLett.103.091304",
  "categories": [
    "astro-ph.CO"
  ],
  "abstract": "We present a theoretical estimate for a new observable: the cross-correlation between the Lyman-alpha flux fluctuations in quasar (QSO) spectra and the convergence of the cosmic microwave background (CMB) as measured along the same line-of-sight. As a first step toward the assessment of its detectability, we estimate the signal-to-noise ratio using linear theory. Although the signal-to-noise is small for a single line-of-sight and peaks at somewhat smaller redshifts than those probed by the Lyman-alpha forest, we estimate a total signal-to-noise of 9 for cross-correlating QSO spectra of SDSS-III with Planck and of 20 for cross-correlating with a future polarization based CMB experiment. The detection of this effect would be a direct measure of the neutral hydrogen-matter cross-correlation and could provide important information on the growth of structures at large scales in a redshift range which is still poorly probed by observations.",
  "revisions": [
    {
      "version": "v3",
      "updated": "2009-08-19T22:41:45.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "98.62.Sb",
      "98.70.Vc",
      "98.62.Ra"
    ],
    "keywords": [
      "cmb lensing",
      "cosmic microwave background",
      "neutral hydrogen-matter cross-correlation",
      "lyman-alpha flux fluctuations",
      "somewhat smaller redshifts"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review Letters",
      "year": 2009,
      "month": "Aug",
      "volume": 103,
      "number": 9,
      "pages": "091304"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 5,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 816213,
      "adsabs": "2009PhRvL.103i1304V"
    }
  }
}