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

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Abstract: We have performed detailed studies of non-linear structure formation incosmological models with light neutrinos. For the first time the effect ofneutrino thermal velocities has been included in a consistent way, and theeffect on the matter power spectrum is found to be significant. The effect islarge enough to be measured in future, high precision surveys. Additionally, weprovide a simple but accurate analytic expression for the suppression offluctuation power due to massive neutrinos. Finally, we describe a simple andfast method for including the effect of massive neutrinos in large-scale N-bodysimulations which is accurate at the 1% level for \sum m nu < 0.15 eV.

Autor: Jacob Brandbyge, Steen Hannestad, Troels Haugboelle, Bjarne Thomsen

Fuente: https://arxiv.org/