The Effect of Thermal Neutrino Motion on the Non-linear Cosmological Matter Power Spectrum

Details The Effect of Thermal Neutrino Motion on the Non-linear Cosmological Matter Power Spectrum The Effect of Thermal Neutrino Motion on the Non-linear Cosmological Matter Power Spectrum

2008-02-26

arxiv.org/abs/0802.3700v2

JCAP 0808:020,2008

Astronomy and Astrophysics

Astrophysics

17 pages, 7 figures. Minimal changes, matches JCAP version

Scientific paper

10.1088/1475-7516/2008/08/020

We have performed detailed studies of non-linear structure formation in cosmological models with light neutrinos. For the first time the effect of neutrino thermal velocities has been included in a consistent way, and the effect on the matter power spectrum is found to be significant. The effect is large enough to be measured in future, high precision surveys. Additionally, we provide a simple but accurate analytic expression for the suppression of fluctuation power due to massive neutrinos. Finally, we describe a simple and fast method for including the effect of massive neutrinos in large-scale N-body simulations which is accurate at the 1% level for \sum m_nu < 0.15 eV.

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