The effect of massive neutrinos on the matter power spectrum

TL;DR

This paper uses large-scale N-body simulations to quantify how massive neutrinos suppress the matter power spectrum in the semi-non-linear regime, providing insights for future cosmological measurements.

Contribution

It presents a detailed simulation-based analysis of neutrino mass effects on matter distribution, highlighting scale-dependent suppression and implications for neutrino hierarchy detection.

Findings

Power suppression of 3.5-90% at k~0.6 h/Mpc for neutrino masses 0.05-1.9 eV

Quantified the scale-dependent impact of neutrinos on matter clustering

Discussed the precision needed in future datasets to distinguish neutrino hierarchies

Abstract

We investigate the impact of massive neutrinos on the distribution of matter in the semi-non-linear regime (0.1<k<0.6 h/Mpc). We present a suite of large-scale N-body simulations quantifying the scale dependent suppression of the total matter power spectrum, resulting from the free-streaming of massive neutrinos out of high-density regions. Our simulations show a power suppression of 3.5-90 per cent at k~0.6 h/Mpc for total neutrino mass, m_nu=0.05-1.9 eV respectively. We also discuss the precision levels that future cosmological datasets would have to achieve in order to distinguish the normal and inverted neutrino mass hierarchies.