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Accurate fitting functions for peculiar velocity spectra in standard and massive-neutrino cosmologies

By J. Bel, A. Pezzotta, C. Carbone, E. Sefusatti and L. Guzzo

Abstract

International audienceWe 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.Key words: large-scale structure of Universe / dark matte

Topics: neutrino: mass, velocity: power spectrum, neutrino: massive, numerical methods, redshift, cosmological model, matter: fluctuation, dark matter: density, numerical calculations, correction: nonlinear, velocity: spectrum, large-scale structure of Universe, dark matter, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Publisher: 'EDP Sciences'
Year: 2019
DOI identifier: 10.1051/0004-6361/201834513
OAI identifier: oai:HAL:hal-01897135v1
Provided by: HAL AMU
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