Resolving Cosmic Neutrino Structure: A Hybrid Neutrino N-body Scheme

TL;DR

This paper introduces a hybrid N-body simulation method that accurately models neutrino clustering on Mpc scales, enabling detailed studies of neutrino effects on cosmic structure formation.

Contribution

It presents the first simulation combining grid- and particle-based methods to resolve neutrino structure efficiently on multiple scales.

Findings

Achieved high accuracy in neutrino clustering simulations.

Performed the largest neutrino N-body simulation to date.

Effectively modeled 10 neutrino hot dark matter components.

Abstract

We present the first simulation capable of resolving the structure of neutrino clustering on Mpc scales. The method combines grid- and particle-based methods and achieves very good accuracy on both small and large scales, while keeping CPU consumption under control. Such simulations are not only ideal for calculating the non-linear matter power spectrum but also particularly relevant for studies of how neutrinos cluster in galaxy- or cluster-sized halos. We perform the largest neutrino N-body simulation to date, effectively containing 10 different neutrino hot dark matter components with different thermal properties.