The Halo Model of Large Scale Structure for Warm Dark Matter

TL;DR

This paper provides a detailed halo model analysis of warm dark matter, highlighting its impacts on structure formation and differences from cold dark matter at small scales.

Contribution

It introduces a comprehensive halo model incorporating WDM effects on various structure components, extending previous models to include subhalo and biasing effects.

Findings

Significant differences in the nonlinear matter power spectrum at small scales between WDM and CDM.

Alterations in halo density profiles, concentrations, and mass functions are key effects of WDM.

Subhalo population effects are important but less dominant than other factors.

Abstract

We present a comprehensive analysis of the halo model of cosmological large to small-scale structure statistics in the case of warm dark matter (WDM) structure formation scenarios. We include the effects of WDM on the linear matter power spectrum, halo density profile, halo concentration relation, halo mass function, subhalo density profile, subhalo mass function and biasing of the smooth dark matter component. As expected, we find large differences at the smallest physical scales in the nonlinear matter power spectrum predicted in the halo model between WDM and cold dark matter even for reasonably high-scale WDM particle masses. We find that significant effects are contributed from the alteration of the halo density profile and concentration, as well as the halo mass function. We further find that the effects of WDM on the subhalo population are important but sub-dominant. Clustering effects of the biasing of the smooth component in WDM is not largely significant.