Large-scale dark matter simulations

@article{Angulo2022LargescaleDM,
  title={Large-scale dark matter simulations},
  author={Ra{\'u}l E Angulo and Oliver Hahn},
  journal={Living Reviews in Computational Astrophysics},
  year={2022},
  volume={8},
  pages={1-200}
}
  • R. AnguloO. Hahn
  • Published 9 December 2021
  • Physics
  • Living Reviews in Computational Astrophysics
We review the field of collisionless numerical simulations for the large-scale structure of the Universe. We start by providing the main set of equations solved by these simulations and their connection with General Relativity. We then recap the relevant numerical approaches: discretization of the phase-space distribution (focusing on N -body but including alternatives, e.g., Lagrangian submanifold and Schrödinger–Poisson) and the respective techniques for their time evolution and force… 

A minimal model for massive neutrinos in Newtonian N-body simulations

We present a novel method for including the impact of massive neutrinos in cold dark matter N-body simulations. Our approach is compatible with widely employed Newtonian N-body codes and relies on

Recent developments and connections to selected plasma problems

The cosmic large-scale structures of the Universe are mainly the result of the gravitational instability of initially small density fluctuations in the dark-matter distribution. Dark matter appears

On General-Relativistic Lagrangian Perturbation Theory and Its Non-Perturbative Generalization

The Newtonian Lagrangian perturbation theory is a widely used framework to study structure formation in cosmology in the nonlinear regime. We review a general-relativistic formulation of such a

Exploring the effects of primordial non-Gaussianity at galactic scales

. While large scale primordial non-Gaussianity is strongly constrained by present-day data, there are no such constraints at Mpc scales. Here we investigate the effect of significant small-scale

Cosmological perturbation theory using generalized Einstein de Sitter cosmologies

. The separable analytical solution in standard perturbation theory for an Einstein de Sitter (EdS) universe can be generalized to the wider class of such cosmologies (“general-ized EdS”, or gEdS) in

Fisher forecasts for primordial non-Gaussianity from persistent homology

We study the information content of summary statistics built from the multi-scale topology of large-scale structures on primordial non-Gaussianity of the local and equilateral type. We use halo

Snowmass2021 Computational Frontier White Paper: Cosmological Simulations and Modeling

Powerful new observational facilities will come online over the next decade, enabling a number of discovery opportunities in the “Cosmic Frontier”, which targets understanding of the physics of the

Statistics of biased tracers in variance-suppressed simulations

Cosmological simulations play an increasingly important role in analysing the observed large-scale structure of the Universe. Recently, they have been particularly important in building hybrid models

Why not Neutrinos as the Dark Matter? A Critical Review, KATRIN and New Research Directions

We challenge the traditional wisdom that cosmological (big bang relic) neutrinos can only be hot Dark Matter. We provide a critical review of the concepts, derivations and arguments in foundational

Fisher matrix for the one-loop galaxy power spectrum: measuring expansion and growth rates without assuming a cosmological model

We introduce a methodology to extend the Fisher matrix forecasts to mildly non-linear scales without the need of selecting a cosmological model. We make use of standard non-linear perturbation theory

References

SHOWING 1-10 OF 753 REFERENCES

Structure formation in large-volume cosmological simulations of fuzzy dark matter: impact of the non-linear dynamics

While the standard cosmological model, ΛCDM, agrees well with a host of cosmological data on large scales, a number of contentious small-scale tensions and the unknown physical (e. g. particle)

Simulating the complexity of the dark matter sheet I: numerical algorithms

At early times, dark matter has a thermal velocity dispersion of unknown amplitude which, for warm dark matter (WDM) models, can influence the formation of non-linear structure on observable

Cosmological N -body simulations including radiation perturbations

Cosmological $N$-body simulations are the standard tool to study the emergence of the observed large-scale structure of the Universe. Such simulations usually solve for the gravitational dynamics of

Initial Conditions for Accurate N-Body Simulations of Massive Neutrino Cosmologies

The set-up of the initial conditions in cosmological N-body simulations is usually implemented by rescaling the desired low-redshift linear power spectrum to the required starting redshift

How closely do baryons follow dark matter on large scales

We investigate the large-scale clustering and gravitational interaction of baryons and dark matter (DM) over cosmic time using a set of collisionless N-body simulations. Both components, baryons and

Cosmological perturbations for two cold fluids in ΛCDM

The cosmic large-scale structure of our Universe is comprised of baryons and cold dark matter (CDM). Yet it is customary to treat these two components as a combined single-matter fluid with vanishing

AX-GADGET: a new code for cosmological simulations of Fuzzy Dark Matter and Axion models

We present a new module of the parallel N-Body code P-GADGET3 for cosmological simulations of light bosonic non-thermal dark matter, often referred as Fuzzy Dark Matter (FDM). The dynamics of the FDM

DEMNUni: the clustering of large-scale structures in the presence of massive neutrinos

We analyse the clustering features of Large Scale Structures (LSS) in the presence of massive neutrinos, employing a set of large-volume, high-resolution cosmological N-body simulations, where

Modelling the large-scale mass density field of the universe as a function of cosmology and baryonic physics

We present and test a framework that models the three-dimensional distribution of mass in the Universe as a function of cosmological and astrophysical parameters. Our approach combines two different
...