Voids in massive neutrino cosmologies
Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Date Issued
2015
Author(s)
Abstract
Cosmic voids are a promising environment to characterize neutrino-induced effects on the large-scale distribution of matter in the universe. We perform a comprehensive numerical study of the statistical properties of voids, identified both in the matter and galaxy distributions, in massive and massless neutrino cosmologies. The matter density field is obtained by running several independent N-body simulations with cold dark matter and neutrino particles, while the galaxy catalogs are modeled by populating the dark matter halos in simulations via a halo occupation distribution (HOD) model to reproduce the clustering properties observed by the Sloan Digital Sky Survey (SDSS) II Data Release 7. We focus on the impact of massive neutrinos on the following void statistical properties: number density, ellipticities, two-point statistics, density and velocity profiles. Considering the matter density field, we find that voids in massive neutrino cosmologies are less evolved than those in the corresponding massless neutrinos case: there is a larger number of small voids and a smaller number of large ones, their profiles are less evacuated, and they present a lower wall at the edge. Moreover, the degeneracy between σ8 and Ων is broken when looking at void properties. In terms of the galaxy density field, we find that differences among cosmologies are difficult to detect because of the small number of galaxy voids in the simulations. Differences are instead present when looking at the matter density and velocity profiles around these voids.
Volume
2015
Issue
11
Start page
018
Issn Identifier
1475-7516
Ads BibCode
2015JCAP...11..018M
Rights
open.access
File(s)![Thumbnail Image]()
Loading...
Name
1506.03088.pdf
Size
2.51 MB
Format
Adobe PDF
Checksum (MD5)
1b78fcc2b2afa0c9f4eec949cc8eb680