Cosmological neutrino N-body simulations of dark matter halo

TL;DR

This paper presents the TianNu cosmological N-body simulation, modeling the co-evolution of massive neutrinos and cold dark matter to study their impact on dark matter halo properties and large-scale structure formation.

Contribution

It introduces a large-scale neutrino-inclusive N-body simulation and analyzes the influence of neutrinos on dark matter halo angular momentum.

Findings

Angular momentum modulus depends on neutrino injection below 50 Mpc.

Neutrino presence affects dark halo properties at certain scales.

Simulation provides new insights into neutrino-dark matter interactions.

Abstract

The study of massive neutrinos and their interactions is a critical aspect of contemporary cosmology. Recent advances in parallel computation and high-performance computing provide new opportunities for accurately constraining Large-Scale Structures (LSS). In this paper, we introduce the TianNu cosmological N-body simulation during the co-evolution of massive neutrino and cold dark matter components via the CUBEP$^3$M code running on the supercomputer Tianhe-2 and TianNu's connected works. We start by analyzing $2.537\times10^7$ dark halos from the scientific data of TianNu simulation, and compare their angular momentum with the matched halos from neutrino-free TianZero, revealing a dependence of angular momentum modulus on neutrino injection at scales below 50 Mpc and around 10 Mpc.