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

TL;DR

This paper investigates how neutrino masses influence the properties of cosmic halos using N-body simulations, comparing density profiles and mass functions to theoretical models, with implications for cosmological surveys and neutrino detection.

Contribution

It provides a detailed analysis of neutrino effects on halo properties, including density profiles and mass functions, validated against theoretical models and highlighting implications for cosmology.

Findings

Neutrino mass affects halo density profiles and mass functions.

Good agreement between N-body simulations and N-one-body method.

Tremaine-Gunn bound for neutrinos is not saturated.

Abstract

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.