{
  "id": "1511.01096",
  "version": "v1",
  "published": "2015-11-03T21:00:02.000Z",
  "updated": "2015-11-03T21:00:02.000Z",
  "title": "Precision measurement of the local bias of dark matter halos",
  "authors": [
    "Titouan Lazeyras",
    "Christian Wagner",
    "Tobias Baldauf",
    "Fabian Schmidt"
  ],
  "comment": "23 pages, 8 figures",
  "categories": [
    "astro-ph.CO"
  ],
  "abstract": "We present accurate measurements of the linear, quadratic, and cubic local bias of dark matter halos, using curved \"separate universe\" N-body simulations which effectively incorporate an infinite-wavelength overdensity. This can be seen as an exact implementation of the peak-background split argument. We compare the results with the linear and quadratic bias measured from the halo-matter power spectrum and bispectrum, and find good agreement. On the other hand, the standard peak-background split applied to the Sheth & Tormen (1999) and Tinker et al. (2008) halo mass functions matches the measured linear bias parameter only at the level of 10%. The prediction from the excursion set-peaks approach performs much better, which can be attributed to the stochastic moving barrier employed in the excursion set-peaks prediction. We also provide convenient fitting formulas for the nonlinear bias parameters $b_2(b_1)$ and $b_3(b_1)$.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2015-11-03T21:00:02.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "dark matter halos",
      "precision measurement",
      "halo mass functions matches",
      "excursion set-peaks approach performs",
      "peak-background split"
    ],
    "publication": {
      "doi": "10.1088/1475-7516/2016/02/018",
      "journal": "Journal of Cosmology and Astro-Particle Physics",
      "year": 2016,
      "month": "Feb",
      "volume": 2016,
      "number": 2,
      "pages": "018"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 23,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2016JCAP...02..018L",
      "inspire": 1402741
    }
  }
}