Accurate fitting functions for peculiar velocity spectra in standard and massive-neutrino cosmologies
Journal
Date Issued
2019
Author(s)
Abstract
We estimate the velocity field in a large set of N-body simulations including massive neutrino particles, and measure the auto-power spectrum of the velocity divergence field as well as the cross-power spectrum between the cold dark matter density and the velocity divergence. We perform these measurements at four different redshifts and within four different cosmological scenarios, covering a wide range in neutrino masses. We find that the nonlinear correction to the velocity power spectra largely depends on the degree of nonlinear evolution with no specific dependence on the value of neutrino mass. We provide a fitting formula based on the value of the rms of the matter fluctuations in spheres of 8 h-1 Mpc, describing the nonlinear corrections with 3% accuracy on scales below k = 0.7 h Mpc-1.
Volume
622
Start page
A109
Issn Identifier
0004-6361
Ads BibCode
2019A&A...622A.109B
Rights
open.access
File(s)![Thumbnail Image]()
Loading...
Name
Bel_2019_aa34513-18.pdf
Description
Pdf editoriale
Size
723.51 KB
Format
Adobe PDF
Checksum (MD5)
62814d3f6635fb5e6f587b9e95add86d