Primordial non-Gaussianity in density fluctuations

TL;DR

This paper uses N-body simulations to study how primordial non-Gaussianity affects the evolution of cosmic density fluctuations and large-scale structure formation.

Contribution

It introduces a simulation framework incorporating primordial non-Gaussianity and analyzes its impact on the non-linear power spectrum evolution.

Findings

Primordial non-Gaussianity influences the higher order moments of density fluctuations.

Non-Gaussianity causes measurable discrepancies in the non-linear power spectrum.

The study provides insights into the evolution of non-Gaussian features over cosmic time.

Abstract

We present N-body cosmological numerical simulations including a primordial non-Gaussianity in the density fluctuation field quantified by the non-linear parameter $f_{NL}$. We have used MPGRAFIC code to produce initial conditions and the Adaptive Mesh Refinement (AMR) code RAMSES to evolve the large scale structure formation. We estimated the higher order momenta of the initial distribution of density fluctuations, investigated the redshift evolution of the non-linear power spectrum and estimated the discrepancy introduced by the primordial non-Gaussianity in the non-linear power spectrum.