Imprint of primordial non-Gaussianity on dark matter halo profiles

TL;DR

This paper investigates how primordial non-Gaussianity influences dark matter halo density profiles using a semi-analytical model and excursion set theory, finding minimal effects except in the innermost regions.

Contribution

It extends the semi-analytical model for halo profiles to include non-Gaussian initial conditions using path-integral excursion set theory.

Findings

Primordial non-Gaussianity slightly increases inner halo profile shapes.

Effects are at sub-percent level for currently allowed non-Gaussianity values.

Significant impact only in the very innermost halo regions.

Abstract

We study the impact of primordial non-Gaussianity on the density profile of dark matter halos by using the semi-analytical model introduced recently by Dalal {\it et al.} which relates the peaks of the initial linear density field to the final density profile of dark matter halos. Models with primordial non-Gaussianity typically produce an initial density field that differs from that produced in Gaussian models. We use the path-integral formulation of excursion set theory to calculate the non-Gaussian corrections to the peak profile and derive the statistics of the peaks of non-Gaussian density field. In the context of the semi-analytic model for halo profiles, currently allowed values for primordial non-Gaussianity would increase the shapes of the inner dark matter profiles, but only at the sub-percent level except in the very innermost regions.