Neutrinos in Non-linear Structure Formation - The Effect on Halo Properties

Details Neutrinos in Non-linear Structure Formation - The Effect on Halo Properties Neutrinos in Non-linear Structure Formation - The Effect on Halo Properties

2010-04-23

arxiv.org/abs/1004.4105v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

20 pages, 8 figures

Scientific paper

We use N-body simulations to find the effect of neutrino masses on halo properties, and investigate how the density profiles of both the neutrino and the dark matter components change as a function of the neutrino mass. We compare our neutrino density profiles with results from the N-one-body method and find good agreement. We also show and explain why the Tremaine-Gunn bound for the neutrinos is not saturated. Finally we study how the halo mass function changes as a function of the neutrino mass and compare our results with the Sheth-Tormen semi-analytic formulae. Our results are important for surveys which aim at probing cosmological parameters using clusters, as well as future experiments aiming at measuring the cosmic neutrino background directly.

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