{
"id": "1812.02731",
"version": "v1",
"published": "2018-12-06T18:59:40.000Z",
"updated": "2018-12-06T18:59:40.000Z",
"title": "A new scale in the bias expansion",
"authors": [
"Giovanni Cabass",
"Fabian Schmidt"
],
"comment": "26+5 pages, 5 figures",
"categories": [
"astro-ph.CO",
"astro-ph.GA"
],
"abstract": "The fact that the spatial nonlocality of galaxy formation is controlled by some short length scale like the Lagrangian radius is the cornerstone of the bias expansion for large-scale-structure tracers. However, the first sources of ionizing radiation between $z\\approx 15$ and $z\\approx 6$ are expected to have significant effects on the formation of galaxies we observe at lower redshift, at least on low-mass galaxies. These radiative-transfer effects introduce a new scale in the clustering of galaxies, i.e. the finite distance which ionizing radiation travels until it reaches a given galaxy. This mean free path can be very large, of order $100\\,h^{-1}\\,{\\rm Mpc}$. Consequently, higher-derivative terms in the bias expansion could turn out to be non-negligible even on these scales: treating them perturbatively would lead to a massive loss in predictivity and, for example, could spoil the determination of the BAO feature or constraints on the neutrino mass. Here, we investigate under what assumptions an explicit non-perturbative model of radiative-transfer effects can maintain the robustness of large-scale galaxy clustering as a cosmological probe.",
"revisions": [
{
"version": "v1",
"updated": "2018-12-06T18:59:40.000Z"
}
],
"analyses": {
"keywords": [
"bias expansion",
"radiative-transfer effects",
"mean free path",
"short length scale",
"finite distance"
],
"note": {
"typesetting": "TeX",
"pages": 5,
"language": "en",
"license": "arXiv",
"status": "editable"
}
}
}