Inner structure of dark matter halos at high $z$ in cosmological models with non-power-law primordial spectra

TL;DR

This study compares dark matter halo structures in different cosmological models with non-standard primordial spectra, finding similar density profiles but evolution in inner slopes that can distinguish models.

Contribution

It introduces a comparison of non-power-law primordial spectra models with $ m{ extLambda}$CDM, highlighting differences in inner halo density slope evolution.

Findings

Density profiles are close to NFW across models.

Inner slope evolution varies with redshift.

A toy model explains core formation in halos.

Abstract

We consider three cosmological models with non-power-law spectra of primordial density perturbations and test them against $\Lambda$CDM in density profiles of dark matter halos. We found that, despite the significant difference in initial conditions, the mean density profiles of all models are still close to the Navarro-Frenk-White one, albeit with some dispersion. We demonstrate that the density profile slopes in the innermost part of halo have a significant evolution with $z$, which can be used to identify the cosmological model. We also present a toy model resulting in the appearance of core in the central part of dark matter halo.